Approximately 60 people were killed due to a fire at an immigrant holding facility in Yemen’s capital Sanaa, a Houthi official said on Tuesday.

More than 100 people were injured in the fire which broke out on Sunday. The reason for the fire is still unknown but an air-strike by a Saudi-led coalition fighting the rebel Houthi movement damaged the building nearby.

Heavy casualties caused due to overcrowding and chaos at the facility in addition to the fire. Victims included both African migrants and facility staff.

A commission is formed by the Houthi group to investigate the incident.

According to the official, the facility is for holding migrants who entered the country “illegally” before the procedure of deportation starts.

The International Organization for Migration (IOM) issued a statement confirming the fire and called for “urgent humanitarian access to migrants injured”.

“We are facing challenges accessing the injured due to an increased security presence in the hospitals. Humanitarians and health workers must be given access to support the treatment of those affected by the fire,” it added.

According to the IOM, Yemen remains a transit country for tens of thousands of migrants travelling between the Horn of Africa and Saudi Arabia despite years of war.