MEXICO CITY (CNN) -- Workers were injured in an explosion at the administrative offices of Mexico's state-run Pemex oil company in the country's capital Thursday, state media reported.
The blast prompted an evacuation of personnel from the Pemex offices, a company spokesman told Mexico's state-run Notimex news agency.
Images from the scene showed emergency rescue teams carrying people on stretchers.
It was unclear how many people were injured or what caused the explosion, Pemex spokesman Francisco Montano told Notimex.
"There are injured and significant damage," he said, according to Notimex.