Disgruntled security guard kills four former co-workers

A one-time security guard who was suspended from his job last week shot and killed four people believed to be former co-workers.

Joseph Ferguson, 20, of Sacramento, remained at large hours after Saturday's shootings and is believed to be heavily armed.

Ferguson was suspended for unknown reasons last week from his job with Burns Security.

Police say he made a series of calls to former co-workers on Saturday night threatening to kill them.

He also allegedly made death threats to club-and movie-goers in the city's busy Old Sacramento district.

All four victims were riddled with gunshot wounds, Hahn said. Police found AK-47, shotgun and 9-mm rounds near the victims.

Around 11:20pm police responding to a shots-fired call at a city equipment yard found two dead people, both female Burns security guards in uniform.

Shortly thereafter they found two male victims at the Miller Park Marina about 10 miles north.

One of the men was in uniform and the other was not, but both are believed to be Burns employees.

"At this time we don't know the motive for the shooting. We don't know if he knew the victims or what," Sergeant Daniel Hahn says.

Authorities are continuing to search downtown Sacramento for Ferguson.

They identify he is possibly armed with handguns, rifles and a shotgun.