The Colombo Crimes Division (CCD) which is probing the incident, had launched an operation to apprehend the suspects after their houses had been locked when officials visited the area.
Investigations commenced after the suspects who were travelling in a defender and a prado jeep had allegedly assaulted a van driver after overtaking the vehicle in Kalagedihena on July 16.
The defender jeep, bearing the number WP CAD 8850, and registered under the name of Chandula Amaratunga, had been recovered from a residence in Maharagama last night.
Meanwhile, the owner of the Prado jeep, bearing the number WP CAG 0550, has been identified as Nuwan Amaratunga. Both suspects are residents of Gallegoda, Ingiriya, police said.