TRIPOLI (Reuters) - Muammar Gaddafi vowed defiantly on Friday to triumph over his enemies, vigorously urging supporters in Tripolis Green Square to protect the Libyan nation and its petroleum interests. Addressing cheering supporters from the old city ramparts looking over Green Square, Gaddafi, wearing a winter jacket and a hunters cap that covered his ears, said when necessary he would open Libyas arsenals of guns to the tribes. We can crush any enemy. We can crush it with the peoples will. The people are armed and when necessary, we will open arsenals to arm all the Libyan people and all Libyan tribes, said Gaddafi. Hours earlier, Libyan state television announced that the government would distribute $400 to each family and raise salaries for state employees as much as 150 percent - an apparently unsuccessful bid to head off the demonstrations. Government forces shot dead at least two protesters in the Libyan capital Tripoli on Friday, Arab media reported, as the uprising against Gaddafi closed in on his stronghold. Opponents of Gaddafi have occupied the centre of a town near the capital and are laying makeshift defences to fend off counter-attacks by pro-Gaddafi forces, a witness said. Other witnesses reported heavy gunfire and chaotic scenes in the town of Zawiyah. Around the town, he and other witnesses said, there was a heavy security force presence, including dozens of army jeeps and soldiers with rocket-propelled grenades. The eastern Libyan town of Brega, which hosts an oil terminal, is under rebel control, and defected soldiers are helping rebels to secure the port, Reuters witnesses said on Friday. The White House said on Friday that Obama also had talked to Turkish Prime Minister Tayyip Erdogan about the situation in Libya, including options to ensure their citizens safety and to hold Libyas government accountable for its actions. Russia warned on Friday that Libyan authorities would face prosecution under international law if they did not stop the violence. Britain is sending a Royal Navy destroyer to the coast of Libya and is drawing up plans to pull out British oil workers stranded in desert camps in the country, Prime Minister David Cameron said on Friday. Pakistan, speaking on behalf of the OIC, which links Muslim countries worldwide, said the Libyan peoples demands must be heard. It is a time of awakening, it is a time for reckoning, Pakistans ambassador Zamir Akram said.