Both were sitting in their patrol cars when they were attacked, Des Moines police said. Suspect information was being developed, the force said.
The motive for the attacks is unclear.
Police said there was a "clear and present danger" to officers in Des Moines and Urbandale.
"There`s somebody out there shooting police officers," Sergeant Paul Parizek told reporters.
"We hope we find him before anybody else gets hurt. We definitely don`t want anybody in the public, here in the community to get hurt but there`s a clear and present danger to police officers right now and we`ve doubled up our officers."
Police in Urbandale had taken the same precautions, Sgt Parizek added.
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