Sri Lanka investigates deadly prison riot that left 27 dead, as authorities address security and health concerns for inmates.

Rival inmate clashes at Negombo prison escalated into an attempted jailbreak, leaving 27 people dead. The bloodshed has triggered judicial and rights inquiries, while exposing security and narcotics concerns inside the jail.

The wounded were rushed to the Negombo hospital, about 35km north of the capital Colombo, following overnight clashes between inmates from two drug gangs at the area's main prison, police said.