SAN FRANCISCO — A heavily-armed team of right-wing terrorists carried out a complex attack on the offices of the left-leaning Mother Jones magazine, sources confirmed Wednesday morning.

The group of masked assailants arrived at the magazine’s front entrance in a bright yellow Ford Excursion, police officials said. Surveillance footage showed the truck bore several right-wing bumper stickers, including “Bush/Cheney 2004,” “nObama,” and the Gadsden Flag. The attackers exited the truck and immediately began firing at security personnel, who were quickly overwhelmed. Three of the men then entered the building, while the fourth stayed behind, ostensibly to guard the getaway vehicle.

Sources confirmed 12 employees were dead, including the magazine’s editor and head cartoonist. More than 30 were wounded, although there may still be additional casualties.