An apparent firebomb attack at a DHL warehouse in Birmingham, linked to Russian-backed saboteurs, was believed to be a trial run for a US attack, according to Polish officials.

Poland’s National Prosecutor’s Office has confirmed four arrests after parcels “containing explosives” were allegedly sent via courier companies to countries including the UK.

Counter-terror police in the UK are already investigating whether Russia had any involvement after a suspicious package caught fire at a DHL warehouse in Minworth in July.

Authorities in Germany are also examining several fires thought to have been caused by incendiary devices hidden inside parcels at a warehouse in Leipzig.

Polish Prosecutor Katarzyna Calow-Jaszewska said the latest arrests were related to parcels “which spontaneously ignited or detonated during land and air transport” to EU countries and the UK.

She said the group’s goal was allegedly “to test the transfer channel for such parcels, which were ultimately to be sent to the United States of America and Canada”.

She added that four people involved in “sabotage” and “of an international nature were detained”.

On Monday, Counter Terrorism Policing said the arrests reported by Polish authorities were not carried out as part of its investigation.

It coincides with reports by the Wall Street Journal (WSJ) that the devices were “electric massagers implanted with a magnesium-based flammable substance” and “part of a wider Russian plot”.

Russia has denied involvement. A Kremlin spokesperson told the US newspaper the claims were “traditional unsubstantiated insinuations from the media”.

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A suspicious fire took hold in July at a DHL warehouse in the UK after a package arrived by air, but further details about the plane and its flight path are unknown.

Last month British police said their investigation was “being led by officers from the Met’s Counter Terrorism Command with support from colleagues from Counter Terrorism Policing West Midlands”.

Some 593 police officers were sacked in the year to April 2024, figures show.

The number of those kicked out and barred from returning to the job was a 50% increase on the 394 officers sacked in the previous 12 months, the College of Policing said.

They were from a workforce of more than 147,000 officers across the 43 police forces in England and Wales.

It comes after concerns over the culture in areas of policing following the murder of Sarah Everard by a serving officer in 2021 and the unmasking of then-Met Police sergeant David Carrick as one of Britain’s most prolific sex offenders.

Several officers have also been punished for sharing deeply offensive WhatsApp messages.

The Police Barred List from the College of Policing also gives the reason for the sacking, with 912 recorded in total because multiple reasons can apply to one case.

The most common reason for being sacked was dishonesty, in 125 cases, followed by sexual offences or misconduct in 74 and discriminatory behaviour in 71.

Some 66 cases recorded unlawful access to or disclosure of information while 18 were for being part of a discriminatory WhatsApp group.

Eighteen officers were sacked for possessing indecent images of children and 33 were fired for abusing their position for a sexual purpose.

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Figures broken down by gender and ethnicity

Of those who lost their jobs, 519 were constables and 48 were sergeants, followed by 16 inspectors, five chief inspectors, two superintendents, one chief superintendent and two chief officers.

Some 30 specials – volunteer officers – were also added to the Police Barred List in the year up to 31 March 2024, as were 233 police staff.

Of the 623 officers and specials sacked, 79 were from a black or ethnic minority (BAME) background, accounting for 12.7% of the total dismissed – workforce data shows 8% of officers said they are from a BAME background as of March 31 2024.

Meanwhile, 530 were white and ethnicity was not recorded in the remaining 14 cases.

Of the sacked officers and specials, 491 were male, 97 were female, one preferred to self-describe and 34 preferred not to say.

The Metropolitan Police had the highest number of sacked officers, followed by Greater Manchester Police, West Yorkshire, West Midlands and Essex.

‘Hugely disappointing’

Assistant Chief Constable Tom Harding, director of operational standards at the College of Policing, said: “It is of course, hugely disappointing to see the conduct of a number of officers falling far below the standard that we set for policing and which the public rightly expects.

“However, these figures show that we have effective, robust procedures in place to identify and deal with these officers swiftly, and to prevent them from holding future roles within the police.

“These figures show that there is nowhere to hide for people who fail to meet the high standards set across our police forces.

“Their behaviour tarnishes policing and erodes public trust. The service will continue working to ensure we attract the right people into policing, ensuring that those who fail to meet these high standards have no future in policing.”

More cases of a new strain of mpox have been detected in the UK, officials say.

Last week, the UK Health Security Agency (UKHSA) said a single case of the mpox virus variant Clade 1b had been confirmed in London.

The agency has now announced a further two cases have been detected.

The two patients are household contacts of the first and are currently under specialist care at Guy’s and St Thomas’ NHS Foundation Trust in London, it added.

“The risk to the UK population remains low,” the UKHSA said.

“There has been extensive planning under way to ensure healthcare professionals are equipped and prepared to respond to any further confirmed cases.”

The UKHSA’s chief medical adviser, Professor Susan Hopkins, said: “Mpox is very infectious in households with close contact and so it is not unexpected to see further cases within the same household.

“The overall risk to the UK population remains low. We are working with partners to make sure all contacts of the cases are identified and contacted to reduce the risk of further spread.”

The first case detected in London last week was a person who had been on holiday in Africa.

They developed flu-like symptoms more than 24 hours after returning to the UK and later developed a rash which worsened in the following days.

The agency said contacts of all three cases are being followed up on and would be offered testing and vaccination as needed.

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What are the symptoms of mpox and how is it passed on?

Common symptoms of the disease include a skin rash or pus-filled lesions, which can last between two to four weeks. It can also cause fever, headaches, muscle aches, back pain, low energy and swollen lymph nodes.

Mpox, and the Clade 1b strain, is usually passed on by close physical contact, contact with infected animals, or sexual transmission.

The UK has a stock of mpox vaccines and last month announced more were being procured to support a routine immunisation programme.