Dozens of Roman Catholic priests and religious workers have marched through the southern Mexico city of Ciudad Altamirano to protest the latest in a series of kidnappings, killings and robberies of priests.

Wednesday's marchers were led by Bishop Maximino Martinez. They called for the release of the Rev. Gregorio Lopez Gorostieta, who apparently was kidnapped from a local seminary on Monday.

His pickup truck was found abandoned, and the church has filed a crime report with police, though the motive remains unclear.

Drug cartel violence has made the hotlands region of southern Guerrero state one of the most dangerous in all of Mexico.

At least two priests have been killed in Guerrero state this year and several others have been abducted, robbed or wounded in robbery attempts.