TRIPOLI, Libya - NATO airstrikes pounded two government buildings early Tuesday in the Libyan capital, including the interior ministry, setting them on fire and prompting a government spokesman to suggest the ministry was targeted because it contained files on corruption cases against senior members of the Benghazi-based rebel leadership.

The latest strikes on Gadhafi's stronghold came just hours after the International Criminal Court's chief prosecutor sought arrest warrants for the Libyan leader, his son and the country's intelligence chief for authorizing the killing of civilians in a crackdown on anti-government rebels. Gadhafi's government denied the allegations.

The call for the inquest was the first such action in the Netherlands-based court linked to the Arab uprisings. It opened another potential front against Gadhafi's regime even as the autocratic leader stands firm against widening NATO airstrikes and rebels with growing international backing.

A Libyan government spokesman appealed for a ceasefire and said authorities were likely to release four foreign reporters held in a Tripoli after they face trial in an administrative court, expected later Tuesday.

NATO has stepped up strikes on Tripoli in an apparent attempt to weaken Gadhafi's chief stronghold and potentially target the leader himself. One of the buildings hit early Tuesday was used by the Interior Ministry which is responsible for internal security.

Government escorts took reporters from their hotel to the site of the overnight airstrikes. Smoke and flames engulfed the top floors of the Interior Ministry building as dozens of young men, many of them armed with assault rifles, milled outside the shuttered gate early Tuesday. Some of the men carried a life-sized portrait of Gadhafi, danced before the burning building and chanted: "The revolution will continue!"

Nearby, black smoke poured out of a complex that officials said included offices used by authorities overseeing corruption cases. Soldiers collected half-burnt papers strewn amid the smashed glass and twisted metal as fire fighters sprayed water on the flames.

Moussa Ibrahim, the Libyan spokesman. suggested the ministry was targeted because itumber of people were killed and wounded. It did not elaborate.

Earlier, at least three explosions believed caused by NATO strikes shook windows around the Libyan capital late Monday. It was not immediately clear what was targeted, but Ibrahim said he believed the jets were aiming for Gadhafi's compound.

The international warrants could further isolate Gadhafi and his inner circle and potentially complicate the options for a negotiated settlement. But they also could harden Gadhafi's resolve to stand and fight, since the legal action has been seen in Libya as giving NATO more justification to go after him.

Because the UN Security Council ordered the ICC investigation, UN member states would be obliged to arrest him if he ventured into their territory.

In the Netherlands, prosecutor Luis Moreno-Ocampo said on Monday he was seeking warrants against Gadhafi, his son, Seif al-Islam Gadhafi, and intelligence chief Abd Gadhafi tried first in Libya, then before the world body.

Under Gadhafi's more than four decades in power, the regime "has committed many crimes against the Libyan people, and the Libyan people want to see him punished for that," Ghoga said.