At least two guards have been killed in an attack by former Libyan revolutionary forces on the interim government’s headquarters in Tripoli over suspended payments. The incident occurred on Tuesday when gunmen on trucks loaded with anti-aircraft guns surrounded the building in central Tripoli before opening fire. "Between two to four guards were killed and many others are wounded," AFP quoted an interior ministry official as saying Many people were injured in the attack, he added. Meanwhile, officials said the defense ministry was negotiating with the fighters. The attack comes less than a month after the ruling National Transitional Council (NTC) suspended payouts to those who fought against slain ruler Muammar Gaddafi. The NTC has cited massive fraud in the compensation program such as duplicate payouts, and claims from impostors and even the dead