Donald Trump was booed during an address at the Libertarian Party National Convention on Saturday.

Libertarians have been largely critical of Mr Trump, whose invitation to speak at the party event in Washington caused mass division.

There was some show of support, as he asked for the party’s endorsement, with chants of “USA! USA”, but the former president was booed at several points during his speech.

It was a highly unusual spectacle, as Trump events are heavily staged – which usually guarantees support from his loyal fans.

Mr Trump tried to get the Libertarians on side by describing President Joe Biden as a “tyrant” and the “worst president in the history of the United States”, but he was instead met with cries of: “That’s you.”

Someone in the audience shouted: “Lock him up!” while another said: “Donald Trump is a threat to democracy!”

Cries were also heard of “You had your shot!”, “F*** you” and “You already had four years, you a******”.

Someone carrying a banner that said “No wannabe dictators!” was also dragged away by security.

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The former president tried to endear party members to him by joking about his four criminal indictments, saying: “If I wasn’t a Libertarian before, I sure as hell am a Libertarian now.”

But with more boos from the audience, he hit back: “You don’t want to win” and claimed that the party wants to “keep getting your 3% every four years”.

In the 2016 election, Libertarian candidate Gary Johnson won 3% of the vote, but in 2020, nominee Jo Jorgensen only secured around 1%.

Mr Trump managed to secure a cheer when he promised to reduce the life sentence of Ross Ulbricht, the founder of the illegal drug sales website Silk Road, who is widely championed by Libertarians, and who themselves prioritise individual freedoms and reduced government.

‘I would rather eat my own foot’

The event was a chance for Mr Trump to recruit supporters of independent candidate Robert F Kennedy Jr, who made his own speech at the convention.

But speaking to NBC News, Libertarian Caryn Ann Harlos said of a possible Trump endorsement: “I would rather eat my own foot out of a bear trap.”

Libertarians, who broke out into their signature “End the Fed” chant, to abolish the Federal Reserve, will pick their nomination for the White House on Sunday.

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Mr Biden and Mr Trump will face off again in November in a repeat of the 2020 presidential election – with polling showing most Americans are not in favour of a repeat of that contest.

This could lead to an increase in support for independent or fringe candidates outside the Democrats or Republicans, according to some forecasters.

At least six newborn babies have died after a fire broke out at a children’s hospital in India, according to reports.

Firefighters said they carried 12 newborns out of the centre in the Vivek Vihar district of east New Delhi late on Saturday night, but five of them died due to smoke inhalation.

Two other infants are believed to have already died, according to local media. There are differing reports as to whether six or seven infants have been killed so far.

Another five survived and are being treated in a nearby hospital, Delhi fire department chief Atul Garg said.

The blaze, which broke out on the first floor of the hospital, was put out after about an hour.

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Mr Garg told the ANI news agency that an oxygen cylinder blast was the likely cause of the fire, but there has been no official confirmation.

“It was a very tough operation,” he was quoted as saying by India Today.

“We made two teams. One team started firefighting because there was a blast of cylinders. We can say it was a chain of blasts of cylinders.

“We had to save ourselves also. We started rescue operations for babies as well. Unfortunately, we could not save all the children… That is a regrettable incident.”

The owner of the baby hospital has fled, according to Delhi police.

Arvind Kejriwal, Delhi’s chief minister, called the fire “heartbreaking”, adding that the “causes of the incident are being investigated and whoever is responsible for this negligence will not be spared”.

Earlier on Saturday, at least 27 people were killed in a fire at a crowded amusement park in the city of Rajkot in Gujarat state in western India.

Russia is producing artillery shells around three times faster than Ukraine’s Western allies and for about a quarter of the cost, according to an analysis shared with Sky News.

The figures, produced by the management consulting firm Bain & Company, underline a major challenge faced by the Ukrainian armed forces as they rely on supplies of ammunition from the United States and Europe to battle Russia’s full-scale invasion.

The war has been described from the start as a “battle of fires” because of the volume of artillery rounds used.

It prompted the US, the UK and other European allies to seek to ramp up production in their respective factories, but their ability to manufacture artillery rounds still lags behind Russia’s despite a combined economic strength that far outmatches Moscow’s.

As a result, Ukrainian soldiers on the frontline say for every one round they fire against Russian positions, the invading troops can launch around five shells back.

Battling against the odds, the Ukrainians say they have become skilled at trying to make every round count.

“Often, with just one, two or three shells, we can completely destroy a target,” said Senior Lieutenant Kostiantin, an artillery battery commander with the 57th Brigade, which is fighting against a new Russian invasion into the Kharkiv region, in the northeast of Ukraine.

But the commander said Ukrainian troops still need more supplies.

“We have to keep holding the Russians back… and make every metre of land they try to take cost them hundreds of lives.”

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The research on artillery rounds by Bain & Company, which drew on publicly available information, found that Russian factories were forecast to manufacture or refurbish about 4.5 million artillery shells this year compared with a combined production of about 1.3 million rounds across European nations and the US.

On cost, it said the average production cost per 155 mm shell – the type produced by NATO countries – was about $4,000 (£3,160) per unit, though it varied significantly between countries. This is compared with a reported Russian production cost of around $1,000 (£790) per 152 mm shell that the Russian armed forces use.

Artillery is only one of many munition shortfalls faced by Ukraine.

Sky News visited a group of new recruits in the east of the country who were learning how to use an N-LAW anti-tank missile, first provided to the Ukrainian military by the UK.

They said a shortage of supplies means they just pretend to fire the weapon in training and would only use it for real when in battle – and only then there are any stocks.

“We have a lack of N-LAWs and we need more,” said a soldier with the callsign “Bolt”, who was giving the training to the new soldiers in a reconnaissance battalion of 5th Brigade.

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Asked whether he had a message for the factory workers in the UK who assembled the weapon, Bolt said: “We’d like to thank our Western partners for their help. But, if possible, we would be very grateful if they could provide more NATO munitions.”

The importance of producing weapons and ammunition is why many experts say factory production lines – rather than the frontline – could be where the war in Ukraine is won.

Sky News visited a factory in Belfast in April where the N-LAW missile is assembled by Thales, a global defence company. The weapon is designed by the Swedish firm Saab.

The assembly takes place inside a large hall containing a mixture of machines grinding metal and desks where delicate work takes place on tiny but vital components.

Working hours on the production line at the time were only four days a week from 7am until 4pm, though they were believed to be increasing.

Thales manufactures its own weapons here as well, including Starstreak, a short-range, surface-to-air missile that can take out aircraft, and the Lightweight Multirole Missile (LMM). Both of these systems are also used in Ukraine.

Philip McBride, the managing director of Thales Belfast, said N-LAW production capacity had doubled since the start of the year and there was scope to double it again.

Asked why the expansion only began then, when Russia’s full-scale war erupted in February 2022, he explained it was because of a number of factors.

Firstly, the UK Ministry of Defence supplies Ukraine with N-LAWs, rather than Thales directly. The missiles initially given to the Ukrainian military were those that the British armed forces already had in their own stockpiles.

“They’ve granted that and then they go through their own procurement process, agree what their actual requirement is in the UK… and once they’ve decided that, then they’ll place orders allowing us to ramp up,” Mr McBride said.

Another factor is that it can take up to two years to source the parts that are required for the N-LAW.

However, asked if production at the factory would have been expanded sooner had the Ministry of Defence put in orders earlier, the managing director said: “The earlier an order comes, the sooner we can ramp up production.”

A lot of work is going on at the plant to modernise the equipment and enable a further expansion of production lines.

The number of employees has also grown, with around 900 people now working at the site and at a second facility in Belfast, compared with just 500 a few years ago.