At least two people were killed and 60 more were injured after a gas truck exploded Thursday morning near a maternity hospital in Mexico City, according to Mexico City Mayor Miguel Angel Mancera.

UPDATE 1:40 p.m.: Mancera has revised the death toll to two. At least 60 people were injured in the explosion.

UPDATE 10:44 am: The death toll from the blast reportedly now stands at seven, including four infants.

UPDATE 10:17 am: At least two people have died in the blast, according to officials who spoke to CNN. An unknown number of people remain trapped in the building, which is reportedly on the verge of collapse.

The explosion reportedly took place as a truck was supplying gas to the hospital and a hose burst, causing a leak.