Updated at 2:58 p.m.
Mexico City's mayor says at least two people are dead after a gas tank truck exploded near a maternity and children's hospital in the capital on Thursday.
Earlier, there were conflicting reports about the toll; news reports and officials placed the number of dead at between three and seven.
The dead were identified as a woman and a child.
Television images showed the explosion caused the collapse of a big part of the hospital, the gas truck still smoldering as fighters tried to quell the blaze.
On Twitter, the Secretary of Public Safety said that 37 people were injured and emergency crews were working to find victims amid the rubble.
The Mexican newspaper El Universal reports that three parts of the hospital — the nursery, the emergency room and the administrative area — had collapsed.
Adrián Rubalvaca, the chief of government for that section of the city, said on Twitter that the situation was "grave."