US and UK have launched Tomahawk missiles on Libyan defence targets in Tripoli and along the Mediterranean coast. US Navy Vice-Adm William Gortney told a Pentagon briefing that more than 110 Tomahawk missiles, fired from American and British ships and submarines, hit about 20 Libyan air and missile defence targets. He said, Coalition forces have launched 'Operation Odyssey Dawn' to enforce UN Security Council Resolution 1973, which protects the Libyan people from their ruler Muammar Gaddafi. In a statement, Pentagon said that they targeted radars and anti-aircraft sites around the capital Tripoli and other facilities along the Mediterranean coast.Earlier, French warplanes reportedly hit four tanks used by the Gaddafi's forces on the outskirts of the opposition stronghold of Benghazi, on a day when opposition fighters in the city came under constant artillery and mortar fire.However, Libyan state television reported civilian targets in Tripoli have been bombarded, as well as fuel stores in Misrata. The state news agency reported that there have been civilian casualties as a result of this aggression.The action by coalition forces came after their leaders approved military strikes against Gaddafi's forces. In Brasilia, US President Barack Obama said he has authorised the US Forces to begin a limited military action in Libya and that action has begun.In London, British Prime Minister David Cameron said British forces are in action over Libya. He said, what they are doing is necessary, legal and right.French President Nicolas Sarkozy, earlier, noted his country's warplanes are already targeting Gaddafi's forces.Russia, however, regretted the armed intervention by foreign forces in Libya. In a statement, Russian Foreign Ministry spokesman Alexander Lukashevich also called for a ceasefire in the north African country as soon as possible.In a brief statement on state television, Gaddafi said the air strikes marked the beginning of another crusade, He said, the Mediterranean and North Africa are being turned into a battleground.Meanwhile, UN Secretary General Ban Ki-moon told a meeting of top world officials that Libyan Prime Minister has assured him of compliance with the ceasefire.The UN Security Council resolution, adopted on Thursday, called for an immediate ceasefire and authorised all necessary measures for protecting civilians in Libya from Gaddafi's forces.