Gunmen executed two sons of two prominent Mexican journalists in the northern city of Chihuahua, a spokesman for the state attorney general's office said on Sunday, and police found seven bodies dumped in a Mexico City suburb.

Alfredo Paramo, 20, and Diego Paramo, 21, were shot dead in Chihuahua early on Saturday after being chased through the streets by gunmen in a car, said spokesman Carlos Gonzalez.

They are the sons of well-known Mexican financial journalist David Paramo, who hosts a radio show, appears on TV Azteca and has a national newspaper column, and Martha Gonzalez, the editor of the local El Peso newspaper.

"We still don't know what they were doing there," Carlos Gonzalez said. "But this has nothing to do with the professional activities of their parents."