A white color van believed to have been used by the gunmen in Monday’s shooting in Kalutara was found in Moragahahena, the officials said.
The abandoned vehicle was found by a policemen team investigating the shooting which left seven men including two prison guards dead.
The police media spokesperson’s office said currently eight police teams have been deployed to investigate the incident.
The shooting occurred at around 7.30 am yesterday after an unidentified group of persons had opened fire at a prison bus near the Kalutara prison.
The gunmen who arrived for the attack had been attired in a dress similar to a police uniform, sources said.