ROCHESTER, N.Y. (AP) _ Federal agents are trying to determine the source of 30-round magazines used by felon William Spengler Jr. when he killed two West Webster firefighters and wounded two others after luring them by burning his house.

Scott Heagney of the Bureau of Alcohol, Tobacco, Firearms and Explosives sayS that agents are investigating whether the magazines were bought in Pennsylvania. New York has a 10-round limit on magazine capacity while Pennsylvania has no limit.

Spengler's former neighbor, Dawn Nguyen (WHEN), is charged with buying the convicted felon a rifle and shotgun at an upstate New York Gander Mountain store and lying on the paperwork by saying they were for her. She was not charged with buying the magazines.