Three men arrested in connection with the blast at hospital . The explosion happened on a busy road near the main railway station of the city and left two people dead. The hospital is 70 % collapsed , Mancera said , although some walls and steel columns are still standing . Mexico City 's mayor says a gas leak was reported , then there was an explosion .
Three men arrested in connection with the blast at hospital . The explosion happened on a busy road near the main railway station of the city and left two people dead. Mexico City 's mayor says a gas leak was reported , then there was an explosion .