Kyrees Sullivan, 16, and Harvey Evans, 15, were killed in Cardiff after their bike crashed in May 22.
"They had previously been served with a gross misconduct notice, along with the passenger in the police vehicle, notifying them their conduct was under investigation."It should be stressed that the serving of notices and the criminal letter do not necessarily mean that disciplinary or criminal proceedings will follow.
"Our independent investigation is progressing well and I want to again thank the local community for the support provided to our investigation, including through the sharing of CCTV evidence."
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