Officials in southern Afghanistan say a roadside bomb has killed four people, including an intelligence officer.

Officials say Mohammad Ali Barak, an intelligence chief in Helmand province's Nad Ali district, and his three bodyguards were killed when a remote-controlled explosive device ripped through their vehicle Saturday.  Authorities blame the attack on Taleban rebels.

The attack was the latest in a spate of insurgent violence to hit Helmand.  On Friday, Taleban gunmen killed the chief government official in Sangin district, just hours after a clash between police and Taleban fighters that left eight guerrillas dead and four police officers wounded.

Some information for this report was provided by AFP and Reuters.