Officials in Bahrain have opened an investigation into the cause of fire that killed 13 people in a labor camp.

The official Bahrain News Agency says the public prosecutor’s office is leading the probe into Friday’s blaze in the capital Manama.

The report Saturday said fire collapsed the roof of the three-story building used to house workers.

Special compounds for migrant laborers are common across the Gulf. For years, rights groups have pressed for better living conditions for the mostly South Asian workers.