The Police said that the driver was arrested in Piliyandala.
Gunmen had opened fire from inside a car at a restaurant in Soysapura, Moratuwa, damaging the glass at the entrance, on the 29th of May and had fled the area.
The main suspect was later arrested over the incident.
A Sergeant and two Constables were also interdicted over the attack.
The three Police officers were on duty at a roadblock setup close to the restaurant at the time of the attack. (Colombo Gazette)