NEW YORK - The FBI on Saturday dismissed Pakistani Taliban leader Baituallah Mehsuds claim that he was responsible for an attack on a US immigration assistance centre in New York state in which 14 people were killed. Based on the evidence, we can firmly discount that claim, FBI spokesman Richard Kolko said, when contacted by TheNation. A man armed with two handguns killed 13 people at the center on Friday before apparently turning the gun on himself, authorities said in New York. Mehsud told a media organisation in Pakistan by telephone from an undisclosed location earlier Saturday that his group was responsible. I accept responsibility. They were my men. I gave them orders in reaction to US drone attacks, he said. Meanwhile, police said the gunman who attacked the centre in Binghamton, New York, on Friday was a Vietnamese immigrant who recently lost his job and was upset about his inability to learn English. Police Chief Joseph Zikuski, speaking at a televised press conference, identified the shooter as Jiverly Wong, who had changed his name to Voong. Zikuski said the motive remains unclear. What we have been told from the people close to him is that this action he took was not a surprise to them, Zikuski said. He said contrary to earlier reports there were no ties to terrorism in Fridays shooting. The police chief said Wong had received a permit for two guns in 1996 and 1997, and that the two guns recovered at the scene were the weapons listed on the permit. Wong wore a bulletproof vest when he arrived at the building on Front Street, Zikuski said. The thinking may have been that he was going take the police on, he said. Binghamton is about 170 miles northwest of New York city. The name of the victims will be released later once the autopsies have been completed and families notified, Zikuski said.