U.S. forces killed four suspects and captured 33 others Saturday in raids in northern Iraq and along the Tigris River Valley, the military said.

The four were killed in a raid targeting an insurgent group believed to be coordinating logistical support from Iran for Shiite militias in Iraq, the U.S. military said in a statement. The killings took place Saturday in the town of Qasirin in Diyala province, northeast of Baghdad, it said.

During the operation, U.S. troops called in fighter jets to fire on a suspected weapons cache below, destroying it, the military said.

Among those detained in other raids Saturday was the alleged leader of a terror group responsible for planting roadside bombs in Mosul, the U.S. military said in another statement. Another member of the group was also taken into custody, it said.

West of Tarmiyah, U.S. troops captured 20 suspects accused of having ties to a high-ranking Al Qaeda in Iraq figure, the military said. Two more suspects were also arrested for alleged ties to another leader from the same group, it said.

Four more suspects were detained for alleged involvement in a sniper cell that employed 35 gunmen, the statement said.

In Kirkuk, five people were captured — three accused of association with an Al Qaeda media cell, and two for involvement in car bomb attacks, the military said.