BOMBING UPDATE

BAGHDAD - A large flatbed truck packed with as much as 1,500 pounds of military munitions from Saddam Hussein's old arsenal was used to blow up U.N. headquarters in Baghdad, the FBI agent in charge of the investigation said yesterday.

Special Agent Thomas Fuentes said human remains found among the wreckage of the vehicle, a Russian-made cargo truck, indicated Tuesday's bombing was a suicide attack.

Fuentes said it was too early to tell whether the attack was carried out by guerrillas loyal to Hussein or by foreign terrorists, and he said a large amount of military munitions in Iraq were "readily available to any number of groups."