A total of 31 people have been charged in connection with riots in Cardiff last year.
Some 27 people have been charged with the offence of riot, while a further four have been charged with causing or threatening to cause criminal damage.
South Wales Police referred itself to the police watchdog, the Independent Office for Police Conduct (IOPC), after footage was shared on social media of a police van appearing to follow the two boys on the bike minutes before the crash.
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It emphasised that this did not necessarily mean disciplinary or criminal proceedings would follow.
Harvey’s family said their hearts were “truly broken”, describing the 15-year-old as someone who lived “life to the full”.
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His family also appealed for “peace within the community” and asked people to allow the police to investigate the crash.
Kyrees was a “handsome young man” and a “loving son and brother”, his family said.
They added that he and Harvey “went everywhere together” and were loved “not only by their families but by their community as well”.
In the hours that followed the collision, fireworks and other missiles were thrown at a line of police officers, while at least two vehicles were set alight.
Police confirmed shortly after the incident that 11 injured officers were taken to hospital, while four others were treated at the scene.
The Crown Prosecution Service (CPS) said there should be no reporting, commentary or sharing of information online which could prejudice legal proceedings.
“The Crown Prosecution Service reminds all concerned that criminal proceedings against these individuals are now active and that they have a right to a fair trial,” said Jenny Hopkins, the CPS’s chief crown prosecutor for Wales.
The defendants charged in relation to the riots range in age from 15 to 53 and are expected to appear at Cardiff Magistrates’ Court in the coming weeks.