A prison bus was shot at by unidentified gunmen, in Kalutara, a short while ago, killing six persons, including the underworld leader 'Samayan'. 

A prison officer is also among those who died in the attack, the Police said. 

The bus came under attack while the inmates were being transported to the Magistrate's Courts premises. 

Those who sustained injuries due to the attack have been admitted to the Nagoda  Hospital, Kalutara. 

Underworld Leader Aruna Udaya Shantha alias 'Samayan' came under a similar attack within the Kaduwela Magistrate's Court premises, in 2015, and sustained critical injuries.

He was arrested by the Police over charges of rape, manslaughter and robbery.