Des Moines officers Susan Farrell and Carlos Puente-Morales, who had been on the job less than six months, were killed in the crash that occurred around 12.40 am today on Interstate 80 west of Des Moines, police spokesman Sgt Paul Parizek said.
The officers had been returning the prisoner from Council Bluffs to Des Moines when their sport utility vehicle was struck by a vehicle driving the wrong way on the freeway, police said.
Investigators had not yet determined by today morning whether the prisoner being transported was wearing a seat belt, he said.
The Iowa State Patrol is investigating.
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Parizek and Police Chief Dana Wingert were visibly upset at a news conference held later today morning to give initial details of the crash.
Farrell, 30, and Puente-Morales, 34, had graduated from the police academy in October, Parizek said.
"We face a nightmare that no one ever wants to experience," Wingert said during the conference. "Words cannot express what this loss means."