Unidentified gunmen on Monday fired shots at the house of one of the key eye witnesses to the 2012 shooting at Welikada prison.
The witness, Sudesh Nandimal, wa not injured in the attack. He was residing at his sister's house in Moratuwa.
Several shots were fired at the property's gate. The police were informed at 11pm last night, the Daily Mirror reported.
In July, an inquiry was launched into the Welikada incident, where 27 inmates, who were mainly Sinhalese were killed during a prison riot by security forces.