San Jose gunman stockpiled weapons and 22,000 rounds of ammunition

Officials say the guns Samuel James Cassidy used to kill nine of his coworkers at a California rail yard appear to be legal

A gunman who killed nine of his co-workers at a rail yard in San Jose, California, had stockpiled weapons and ammunition at his home, including 12 guns and 22,000 rounds of ammunition, authorities said on Friday.

Investigators found the cache of weapons at the home of Samuel James Cassidy, the Santa Clara county sheriff's office said in a news release. They also turned up multiple cans of gasoline and suspected molotov cocktails. Authorities have said that Cassidy set his house on fire using a timer or slow-burn device to coincide with his attack.

The guns he used to open fire on his co-workers appear to be legal, officials said. They have not said how he obtained them.