UPDATED Monday, February 25, 2013 --- 4:58 p.m.

MADISON, Wis. (AP) -- Madison police arrested two teenage boys after witnesses say they pulled a real-looking gun from a backpack on a Metro Transit bus last week.

Police say the incident happened Thursday afternoon on Madison's south side. The 13- and 14-year-old middle-school students from Madison were arrested the next day.

A police spokesman says witnesses told the bus driver the teens had pulled a real-looking gun from a backpack and possibly pointed it at others.

The Wisconsin State Journal reports investigators found two BB guns and ammunition at the home of one of the teens.

Police say the boys were tentatively charged with using a facsimile firearm and were taken to the Juvenile Reception Center.

Copyright 2013: Associated Press

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Posted Monday, February 25, 2013 --- 3:09 p.m.

Incident Report from the Madison Police Department:

Incident Type: Weapons Violation

Incident Date: 02/21/2013 - 2:45 PM

Address: 600 block Buick St.

Arrested: Male, age 13, Madison

Male, age 14, Madison
Suspects were arrested and taken to the Juvenile Reception Center each on a tentative charge of Use of Facsimile Firearm.

Details: Madison Police arrested two middle school students Friday following reports that they had produced a facsimile firearm while riding home from school on a Madison Metro bus Thursday afternoon.

Witnesses told a bus driver that the teens had pulled a real looking gun from a backpack and possibly pointed it at others. Officers recovered two BB guns, and ammunition, from the home of one of the arrested teens.