CAIRO — Deep cracks opened in Moammar Gadhafi's regime Monday, with Libyan government officials at home and abroad resigning, air force pilots defecting and a major government building ablaze after clashes in the capital of Tripoli. Protesters called for another night of defiance against the Arab world's longest-serving leader despite a crackdown.
At sunset, pro-Gadhafi militia drove around Tripoli with loudspeakers and told people not to leave their homes, witnesses said, as security forces sought to keep the unrest that swept eastern parts of the country — leaving the second- largest city of Benghazi in protesters' control — from overwhelming the capital of 2 million people.
State TV said the military had "stormed the hideouts of saboteurs" and urged the public to back security forces. Protesters called for a demonstration in Tripoli's central Green Square and in front of Gadhafi's residence, but witnesses in various neighborhoods described helicopters hovering above the main seaside boulevard and pro-Gadhafi gunmen firing from moving cars and even shooting at homes.
Youths trying to gather in the streets were forced to scatter and run for cover, said one witness, who like many reached in Tripoli by the Associated Press spoke on condition of anonymity.
Gadhafi, whose whereabouts were not known, appeared to have lost the support of at least one major tribe, several military units and his own diplomats, including the delegation to the United Nations. Deputy U.N. Ambassador Ibrahim Dabbashi accused Gadhafi of genocide against his own people.
Secretary of State Hillary Rodham Clinton called on Gadhafi to "stop this unacceptable bloodshed" and said the world was watching the events "with alarm."
Warplanes swooped low over Tripoli in the evening and snipers took up position on roofs, apparently to stop people outside the capital from joining protests, according to Mohammed Abdul-Malek, a London-based opposition activist in touch with residents.
Communications to the capital appeared to have been cut, and residents could not be reached by phone from outside the country. State TV showed video of hundreds of Gadhafi supporters rallying in Green Square, waving palm fronds and pictures of the Libyan leader.
State TV quoted Gadhafi's son, Seif al-Islam, as saying the military conducted airstrikes on remote areas, away from residential neighborhoods, on munitions warehouses, denying reports that warplanes attacked Tripoli and Benghazi.
Jordanians who fled Libya gave horrific accounts of a "bloodbath" in Tripoli, saying they saw people shot, scores of burned cars and shops, and what appeared to be mercenaries from other African countries.
The first major protests to hit an OPEC country — and major supplier to Europe — have sent oil prices up, and the industry has begun eyeing reserves touched only after Hurricane Katrina in 2005 and the first Gulf War in 1991.
Tripoli was largely shut down Monday, with schools, government offices and most stores closed, except for a few bakeries, said residents, who hunkered down in their homes. Armed members of pro-government organizations called "Revolutionary Committees" hunted for protesters in Tripoli's old city, said one protester named Fathi.
Members of the militia occupied the city center and no one was able to walk the street, said one resident who lived near Green Square described a "very, very violent" situation.
"We know that the regime is reaching its end and Libyans are not retreating," the resident said. "People have a strange determination after all that happened."
Another witness said armed men dressed in militia uniforms roamed the capital's upscale diplomatic neighborhood and opened fire on a group of protesters. People wept over the dead.
Residents hoped that help would arrive from the other parts of the country.
The eruption of turmoil in the capital after seven days of protests and bloody clashes in Libya's eastern cities sharply escalated the challenge to Gadhafi. His security forces have unleashed the bloodiest crackdown of any Arab country against the wave of protests sweeping the region, which toppled the leaders of Egypt and Tunisia. At least 233 people have been killed so far, according to New York-based Human Rights Watch.
British Prime Minister David Cameron, visiting neighboring Egypt, called the Libyan government's crackdown "appalling."
"The regime is using the most vicious forms of repression against people who want to see that country — which is one of the most closed and one of the most autocratic — make progress," he told reporters in Cairo.