AP  In this photo rendered from video and released by WBNG-TV in Binghamton, N.Y., authorities take up positions 

BINGHAMTON, N.Y. A gunman walked into an immigration services center in downtown Binghamton on Friday, killing an unknown number of people, wounding at least six and taking as many as 41 hostage, officials said.

Two handguns were recovered at the scene, said a law enforcement official who was not authorized to speak publicly about the details of an ongoing hostage situation and was speaking on condition of anonymity.

Mayor Matthew Ryan told the Binghamton Press & Sun Bulletin that the gunman had a high-powered rifle.

The FBI was sending hostage negotiators and an evidence response team to the scene. The Bureau of Alcohol, Tobacco, Firearms and Explosives was also sending agents to Binghamton.