Blast at Mexican Plant Kills At Least Three

A blast at a Mexican petrochemical factory killed at least three people and injured dozens on Wednesday afternoon.

Officials are not sure what caused the explosion at the facility, located in the state of Veracruz and owned by Pemex, Mexico's national oil company, Reuters reported. The blast occurred shortly after 3 p.m. and send a cloud of noxious black smoke into the sky, prompting Pemex to urge locals to avoid the site.