RAS LANOUF, Libya (AP) -- Libyan warplanes launched multiple airstrikes Monday on opposition fighters regrouping at an oil port on the Mediterranean coast, the second day of a harsh government counteroffensive to thwart a rebel advance toward Moammar Gadhafi's stronghold in the capital Tripoli.

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President Barack Obama said the U.S. and its NATO allies are still considering a military response to the violence and Britain and France were drafting a U.N. resolution that would establish a no-fly zone.

The anti-government forces trying to oust Gadhafi say they will be outgunned if the regime continues to unleash its air power on them and are pleading for the international community to impose a no-fly zone to protect them from more strikes. However, they oppose foreign troops on the ground.

"We don't want a foreign military intervention, but we do want a no-fly zone, said rebel fighter Ali Suleiman. "We are all waiting for one," he added. The rebels can take on "the rockets and the tanks, but not Gadhafi's air force" he said.

The government has managed to halt for now a rebel advance that began last week when fighters ventured beyond the opposition-controlled eastern half of the country.

The rebels are now struggling to maintain supply lines for weapons, ammunition and food, with many living off junk food, cookies and cans of tuna. They are waiting for rocket launchers, tanks and other heavy weapons to arrive with reinforcements from their headquarters in the eastern city of Benghazi.

Meanwhile, the U.S. has moved military forces closer to its shores to back up its demand that Gadhafi step down. But enforcing a no-fly zone could take weeks to organize, and U.S. Defense Secretary Robert Gates has noted that it must be preceded by a military operation to take out Libya's air defenses. British Foreign Minister William Hague said Sunday that a no-fly zone over Libya is still in an early stage of planning and ruled out the use of ground forces.

Obama said the U.S. will stand with the Libyan people as they face "unacceptable" violence. He said he has authorized millions of dollars in humanitarian aid. He also sent a strong message to Gadhafi, saying he and his supporters will be held responsible for the violence there.

Hague told the House of Commons Monday that Britain is "working closely with partners on a contingency basis on elements of a resolution on a no-fly zone." A British diplomat at the U.N. stressed that the draft resolution is being prepared in case it is needed but no decision has been made to introduce it at the Security Council. He spoke on condition of anonymity because the draft has not been made public.

Libya appears to be sliding toward a civil war that could drag out for weeks, or even months, as rebels try to oust Gadhafi after 41 years. Resorting to heavy use of air attacks signaled the regime's concern that it needed to check the advance of the rebel force toward Sirte - Gadhafi's hometown and a bastion of support for the longtime leader.

Anti-Gadhafi forces would get a massive morale boost if they can blast through Sirte, a major obstacle on the march toward Tripoli.

Libya's main population centers lie along the country's main east-west highway on the Mediterranean coast and the struggle for control of the country is being waged between the government and the rebels trying to push the front line westward toward the capital.

A force estimated at 500 to 1,000 fighters was pushing steadily down the highway toward Tripoli when it was driven out of the town of Bin Jawwad, 375 east of the capital, on Sunday by pro-Gadhafi forces using helicopter gunships, artillery and rockets. The fighting killed at least eight people and wounded 59, according to medical officials.

The rebels regrouped about 40 miles to the east in Ras Lanouf, where MiG fighters circled over rebel positions Monday before launching airstrikes behind their front lines in the morning and afternoon.

In and around Bin Jawwad, pro-regime forces were running patrols Monday and there were minor reports of skirmishes with rebels on the outskirts.

One strike hit a road near the town's only gas station, destroying at least three vehicles and wounding at least two people.

The opposition also holds two main battleground cities close to Tripoli, and the government appears to have solidified control Monday of one of them - Zawiya. Just 30 miles outside Tripoli, Zawiya had been the city closest to the capital in opposition hands.

A Zawiya resident said government tanks and artillery opened fire on rebels around 9:00 am and the attack hadn't stopped when he left the city at 1:30 p.m. All entrances to the city were under government control and the rebels had been driven out of the city's central Martyr's Square and a nearby mosque by the heaviest attack in several days.

"The tanks are everywhere," he said. "The hospital is running out of supplies. There are injured everywhere who can't find a place to go."

Rebels also held much of Misrata, to the east of Tripoli about halfway to Sirte. But Valerie Amos, United Nations under-secretary-general for humanitarian affairs and emergency relief coordinator, said in a statement that the Benghazi Red Crescent reported that Misrata was under attack by government forces again Monday. There have been repeated government attempts to regain control of Misrata.

"Humanitarian organizations need urgent access now," she said. "People are injured and dying and need help immediately."

The uprising against Gadhafi is already longer and much bloodier than the relatively quick revolts that overthrew the longtime authoritarian leaders of neighboring Egypt and Tunisia.

Unusually heavy and sustained shooting that erupted before dawn in Tripoli on Sunday gave rise to rumors and reports that there had been an assassination attempt against Gadhafi by someone inside the fortress-like barracks where he lives.

But a government spokesman, Abdel-Majid al-Dursi, denied it on Monday, calling the claims "baseless rumors."

Hundreds if not thousands of people have died since Libya's uprising began, although tight restrictions on media make it near impossible to get an accurate tally. More than 200,000 people have fled the country, most of them foreign workers. The exodus is creating a humanitarian crisis across the border with Tunisia - another North African country in turmoil after an uprising in January that ousted its longtime leader.

The turmoil is being felt more broadly still in the form of rising oil prices. Libya's oil production has been seriously crippled by the unrest.

The conflict in Libya took a turn late last week when government opponents, backed by mutinous army units and armed with weaponry seized from storehouses, went on the offensive. At the same time, pro-Gadhafi forces have conducted counteroffensives to try to retake the towns and oil ports the rebels have captured since they moved out of the rebel-held east.