A $200,000 reward, trucks with speakers broadcasting messages, unmanned aerial vehicles and airdrops of thousands of leaflets are being used in the search for the three U.S. troops missing after a Saturday attack south of Baghdad.

The U.S. military late Tuesday identified three soldiers killed in the attack and released the names of four others — a mix of three captured soldiers and one other soldier who could not be confirmed as dead. The attack also killed an Iraqi interpreter working with the troops.

“Right now our focus is on searching for the missing soldiers, and we’re trying to isolate the areas where we think they could be,” Maj. Kenny Mintz, the operations officer for 2nd Brigade, 10th Mountain Division, was quoted as saying in a military news release. “The (captors) don’t have freedom of movement; if they have the soldiers, they can’t move them from where they are. We’re doing a deliberate search of the areas for the people responsible for the soldiers we’re looking for.”

Military officials said Iraqi tip-lines also have been busy fielding possible leads in the incident. The leaflets being dropped include both an e-mail address and a phone number for tips. Any information yielded from those sources, officials said, is then routed on to units operating on the ground. More than 4,000 American and Iraqi troops are participating in the search.

An insurgent group that includes al-Qaida in Iraq has claimed responsibility for the attack and capture, saying in Web postings that a search would be futile.

The Pentagon identified those killed as Sgt. James D. Connell, 40, from Tennessee; Pvt. Daniel W. Courneya, 19, from Michigan; and Pvt. Christopher E. Murphy, 21, from Virginia.

The Iraqi soldier acting as the unit’s interpreter was identified as Sabah Barak, according to the 10th Mountain Division Web site.

The four other soldiers whose names were released are Sgt. Anthony J. Schober; Spc. Alex R. Jimenez; Pvt. Joseph J. Anzack; and Pvt. Byron W. Fouty, the division said.

Members of their unit have been operating from a small patrol base in Yusufiyah, south of Baghdad. The base is part of the American military strategy to get troops into neighborhoods and working more closely with the civilian population.

“It’s a hard transition for a lot of units,” Maj. Robert Griggs, of the 4th Battalion, 31st Infantry Regiment, 2nd Brigade Combat Team, 10th Mountain Division, told Stars and Stripes in an interview last week. Grigg’s battalion holds Patrol Base Inchon in Yusufiyah, along with four other company-sized outposts.

“Units are concerned that the enemy may try to overrun them.”

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