loyal to libyan leader, moammar gadhafi. and what you're hearing there, just some of the anti-aircraft fire we heard in the last hour in libya's capital, tripoli. you heard it here as we were talking to nic robertson. still no sign of coalition aircraft, though. no clue, really what they were shooting at. at present, about seven nations actively involved in what's now known as operation odyssey dawn. its aim of course to force the libyan leader, moammar gadhafi, to abide by a united nations' authorized cease-fire and no fly zone. u.s. joint chiefs of staff chairman mike mullen says most of gadhafi's air defense systems and some air fields have been taken out. libyan ground forces have been hit as you can see there. a briefing expected less than half an hour from now from the pentagon. we will of course be bringing that to you live. meantime, the arab league