Gadhafi's Troops Advance on Rebel-Held Cities as U.N. OKs...

Forces loyal to Libyan leader Moammar Gadhafi on Thursday surrounded Ajdabiya, a key rebel-held city, as they continued heavy shelling that killed at least 30 people. Gadhafi's warplanes also began air attacks on Benghazi as the United Nations Security Council voted to approve a no-fly zone over Libya. Ray Suarez reports.