BAGHDAD, Iraq — U.S. and Iraqi soldiers, backed by American warplanes, battled suspected insurgents for hours today in central Baghdad, and 50 militant fighters were killed, the Defense Ministry said.

U.S. helicopters circled above the Haifa Street area where the battle took place, and witnesses said they had seen the aircraft firing into the combat zone. Explosions rang out across the area, just north of the heavily fortified Green Zone.

Maj. Gen. Ibrahim Shaker, a ministry spokesman, said 21 militants were captured, including seven foreign Arabs — including three Syrians — and one Sudanese.

Government spokesman Ali al-Dabbagh said Iraqi forces had decided to wipe out "terrorist hideouts" in the area once and for all. "God willing, Haifa Street will never threaten the Iraqi people again," he said.

Al-Dabbagh also said followers of Saddam Hussein were to blame for the violence.

Elsewhere, a cargo plane carrying Turkish construction workers crashed during landing at an airport near Baghdad, killing 30 people and injuring two, the Turkish Foreign Ministry said. Initial reports indicated the plane crashed due to bad weather and heavy fog.