"There were toys and stuffed animals in the room where the 700 to 800 rounds of ammunition and the three firearms were located," said Chris Condon, spokesman for the Probation Department.
The child was not removed from the home, he said, but the probationer associated with the firearms was arrested and removed from the home.
Nearly 200 officials, including 80 probation officers and 70 deputies and agents from various law enforcement agencies including Immigration and Customs Enforcement and Alcohol, Tobacco and Firearms participated in the sweep, officials said.
The operation targeted adult probationers including those placed on post-release community supervision through Assembly Bill 109.
Of the 355 people targeted, 44 were arrested, Condon said. The majority of the arrests were a result of outstanding warrants and probation violations, but there were some who were booked on new offenses.
"We arrested one woman who was not on probation," Condon said. "She just happened to have a warrant out for her arrest. Not only do we find the people that we're looking for, we also run into other people that have warrants."
During the operation, four pounds of marijuana, four grams of methamphetamine, four handguns, one rifle, a homemade silencer, a total of 1,000 rounds of ammunition as well as a variety of drug paraphernalia and burglary tools were found, authorities said.
"The number of officers and the variety of agencies speaks to the fact that these days in order to get a grasp on the (post-release community supervision) population we all have to work together. We're willing to do these large scale operations," Condon said.