SAM Rainsy Party Member of Parliament Yont Tharo filed complaints with the Ministry of Interior and the Phnom Penh Muncipal Police on Tuesday, imploring them to investigate his son's murder after a traffic accident on Sunday.

Yont Thauron was shot and killed outside a noodle stall near Wat Botum park just minutes after an argument that ensued after his car collided with several motorbikes.

The gunmen, who witnesses said were members of the police department, also seriously wounded three of Yont Thauron's friends.

Witnesses at the crime scene said that after the traffic accident, Yont Thauron and his friends exited their vehicle and ordered the motorbike drivers around them to kneel down and apologise, leading to a furious argument.

"Although my son made a mistake in behaving pridefully, he was unarmed and should not have been killed," Yont Tharo said.

Municipal Police Chief Touch Naruth said that police had already identified the attackers and were working to apprehend them as quickly as possible.