No help is on the way as an oil depot burns near Tripoli's international airport.<br/> <br />These firefighters are at the ready, but can't respond.<br/> <br />They had been working to put out the flames at the oil depot, before it was hit a second time by armed militias Saturday -- forcing them to abandon their efforts.<br/> <br />Authorities say the oil tanks might explode and warn of the possibility of mass casualties.<br/> <br />Libya says at least 22 people have been killed in the clashes -- the most violent since the 2011 ouster of Muammar Gaddafi.<br/> <br />Most Western governments have evacuated their embassies as armed factions try to gain control of the airport.
