American planes are still carrying out bombing raids on Libyan air defences, the Pentagon said on Wednesday.
Colonel David Lapan, a Pentagon spokesman, said an unspecified number of U.S. fighter aircraft had been put under NATO command.
“We do have fighter aircraft, that NATO has, that they can use … for suppression of enemy air defense missions. And they have conducted some of those missions,” Lapan told reporters.
It comes days after Washington said American aircraft had withdrawn from NATO operations.
Meanwhile, Libyan rebels have called upon the alliance to step up their attacks on Gaddafi’s regime.
The country’s state television said NATO planes bombed Misrata on Wednesday.
For the past five weeks, Gaddafi has been shelling Misrata with mortars. It is the only city in western Libya held by the rebels.