STOCKTON, Calif. —

An extra $20,000 reward is being offered for information on those responsible for a deadly Stockton mass shooting during a 2-year-old's birthday party, bringing the total amount of cash reward to $100,000.

Since the Nov. 29 shooting that left four dead and 13 injured , the public has not received any information on suspect descriptions or how many people could be connected. The San Joaquin County Sheriff's Office, the lead investigator, has recently expressed concern that witnesses are not being forthcoming with information.

The Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF) is also a co-investigating agency. On Friday, it announced that it is offering a reward of up to $20,000 for information leading to the arrest and conviction of those responsible for

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