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A police force is being investigated over complaints made by the families of two teenagers who died in an e-bike crash.

Kyrees Sullivan, 16, and Harvey Evans, 15, were being followed by a police van before the bike they were riding crashed in Ely, Cardiff, in May.

The Independent Office for Police Conduct (IOPC) is investigating complaints about South Wales Police.

The deaths led to riots which saw 15 officers injured and dozens arrested.

The driver of a police van and another officer in the vehicle have previously been served with gross misconduct notices and the driver is also being investigated for dangerous driving.

This new investigation will examine the force's response and management of the collision scene on the night, the IOPC said.

It would also look at complaints about the way the families at the scene of the collision were treated and the force's communication with the families following the boys' deaths.

The IOPC said an original investigation into interactions with the teenagers before their deaths was at an advanced stage, with evidence gathering completed.

"We have taken a large number of statements from local residents as the result of our house-to-house enquiries," a spokesperson said.

"We have reviewed hundreds of video clips as well as body-worn video from officers who were at the scene."