By Steve Neavling
ticklethewire.com
The FBI and ATF have joined the investigation into a mass shooting that killed four people, including a 6-year-old boy, and injured 15 others at the popular Gilroy Garlic Festival in California on Sunday.
At least one gunman opened fire and was quickly killed by local police. On Monday morning, authorities warned that a possible accomplice is still on the loose.
The FBI and ATF are assisting Gilroy police.
The motive of the shooting was not immediately clear.
