A group of insurers sued the Port Authority of New York and New Jersey on Thursday over the agency's claim that it is owed $2.1 billion to help rebuild part of New York's World Trade Center, Reuters reported. A group of 10 syndicates at the Lloyd's insurance market and eight other insurance companies filed the complaint in federal court on Thursday. The complaint is in opposition to what they said was the Port Authority's claim for the $2.1 billion "shortfall" made in a written request in March to help rebuild 10 million square feet of commercial space at the site, which the transportation agency owns. "They are looking for additional money for property covered under another policy," said Robert Skinner, an attorney with Ropes & Gray representing the insurers. "We don't comment on pending litigation, and we have not been officially served with the lawsuit yet," said a spokesman for the Port Authority. The Port Authority has already received $950 million from its insurers for damage on Sept. 11, 2001 to World Trade Center property not controlled by developer Larry Silverstein, the insurers said. --More 2303 Local Time 2003 GMT