Published: Jul 24, 2010 8:27 PM EDT
Updated: Jul 24, 2010 5:27 PM EDT

KABUL, Afghanistan (AP) - A massive air and ground search is under way in eastern Afghanistan, where two U.S. Navy service members have disappeared.       

NATO and Afghan officials say the two left their compound in Kabul in a vehicle yesterday and never returned.
      
An Afghan official says they may have been killed or captured by the Taliban. He says they were seen at a bazaar in a dangerous area about two hours south of Kabul.

Meanwhile, in southern Afghanistan, five U.S. troops were killed by bombs today, four of them in a single attack.
      
July is on track to become the deadliest month of the war for Americans.