They said it was not clear whether the boy initially knew it was in his bag.
The seven-year-olds ruschool bag Mother Arrested After Son Takes Gun To Schoolcksack was searched and the semi-automatic pistol, a magazine containing ten rounds and a plastic bag with bullets in it was found.
The boy said he had given the weapon to a friend, at which point she alerted the principal.
An elementary school in New York is locked down after the seven-year-old boy tells staff he has given the gun to a friend.
Deborah Farley was arrested on Friday on several charges including criminal possession of a weapon and endangering the welre of a child.
Police in New York City have arrested the mother of a seven-year-old boy who took a gun and ammunition to school in his rucksack.
A flare gun was found in the second boys bag, police said.
The school,Enable Your Child Obtain The Best Education.school382.typepad.com. 2012-2-5 上午11:41:08 which has been practising for security drills since the Sandy Hook massacre, was immediately locked down.
Police said when the mother learned about the gun she rushed to school and told officials her son had a dental appointment.
Police say the 53-year-olds son had taken the handgun to his Queens elementary school on Thursday.