COLOMBO, Sri Lanka (AP) — Clashes broke out inside a prison in the outskirts of Sri Lanka’s capital, killing at least 25 people, most of them inmates, and injuring more than 100, officials said Monday.

The unrest at the prison in Negombo, about 35 kilometers (22 miles) north of the capital, Colombo, started among inmates on Sunday, and when guards attempted to intervene on Monday, “they (inmates) started attacking the prison officials,” prison spokesman A.C. Gajanayake said.

The Associated Press