The federal government on Monday revoked the license of a gun shop that has been accused of making illegal gun sales and having its guns end up in the hands of criminals, including a person involved in the 1993 World Trade Center bombing.

The Bureau of Alcohol, Tobacco, Firearms and Explosives revoked the license of Lou's Loans of Upper Darby, which means it can no longer sell guns, ATF spokesman John Hageman said.

The agency declined to cite specific reasons for the action.

A man who answered the telephone at the shop on Monday said the owner did not want to comment.

Last year, the family of a 14-year-old boy who was fatally shot with a handgun sued Lou's Loans, alleging that the dealer sold the .25-caliber gun to a "straw buyer," a person buying a weapon for someone else who is not allowed to have one.

The lawsuit, which is pending, was initiated by the Washington-based Brady Center to Prevent Gun Violence on behalf of the family. It alleges that Lou's Loans was linked to at least 441 guns used in crimes between 1996 and 2000, and 178 guns linked to crime in 2003. The suit also alleges that Lou's Loans sold a gun supplied to a co-conspirator of the World Trade Center bombing.

"We're happy to hear that the ATF has finally taken action against Lou's because we know that there have been decades of problems with Lou's Loans' business practices," said Elizabeth S. Haile, a staff attorney with the Brady Center.