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The gunman who ambushed and killed two unsuspecting firefighters as they battled a blaze in upstate New York couldn't buy his weapons legally so he allegedly got his neighbor's daughter to purchase them for him, said U.S. Attorney William Hochul, according to CNN. 

Dawn Nguyen of Rochester, New York, faces charges over allegedly lying when she purchased an AR-15 rifle -- a .223-caliber weapon -- and 12-gauge shotgun that the gunman had with him during the attack.

Authorities say she told the gun dealer that she planned to be the owner of the weapons, but had instead purchased them on June 7, 2010,for gunman William Spengler.

"It is absolutely against federal law to lie relating to the acquisition of firearms," said Hochul, who said Spengler indicated in a suicide note that he had gotten the weapons from the neighbor.

Nguyen, 24, was "turned ... over to ATF (Bureau of Alcohol, Tobacco, Firearms and Explosives) agents to be processed at the federal level, and arraigned by a federal magistrate this afternoon," according to state police Investigator James Newell.

Spengler, 62 -- who had been convicted of killing his grandmother decades ago -- used the same type of weapon employed in the recent assault on Sandy Hook Elementary School, which left 26 people dead, including 20 children. As a convicted felon, Spengler was not allowed to legally possess weapons.