MEXICO CITY, Jan. 31 (Xinhua) -- A powerful blast ripped through the landmark headquarters of Mexico's oil giant Pemex in Mexico City on Thursday, causing causalities and evacuation of the building.
Preliminary reports of causalities remained confusing, with local media saying at least one person was killed in the explosion and some 30 people were injured, but the toll has not been confirmed by authorities.
Local TV broadcast footages showing damaged parts of the high- rise building, with broken concrete and scattered objects which looked like scraps of fallen plasters.
Police, security personnel and emergency vehicles were at the scene. Rescuers wearing hard-hats could be seen searching in the rubble for survivors and the injured.
Pemex, a state-run oil company, said on twitter that the ground floor and mezzanine of the tower was damaged and some workers were injured. It also said the building has been evacuated, but adding the cause of the blast is yet unknown.
There are unconfirmed reports saying the blast may have been caused by a gas explosion in an electric substation in the tower's basement.