The boat used in the mid-sea attack on a fishing boat off Tangalle late on Sunday was seized this afternoon and the boat owner was also arrested.
According to the police media unit, the boat was seized in Tangalle by a police team deployed to investigate the incident.
The police said that the small boat had been used by a 10 member gang to board the multi-day fishing boat on Sunday.
They had later attacked five fishermen, killing 3 and injuring 2 others.
The bodies of the 3 fishermen who were killed and thrown overboard have not yet been been recovered.
The Matara police are conducting further investigations.