WATERLOO, Iowa (AP) — Three Iowa National Guard soldiers have been injured when their vehicle struck an improvised explosive device in Afghanistan.

The Waterloo-Cedar Falls Courier says the incident happened Tuesday.

National Guard Maj. Mike Wunn tells the Courier in an e-mail from Afghanistan that the three soldiers suffered minor injuries and have returned to duty.

Wunn says names of injured soldiers aren’t released unless their injuries require evacuation and more extensive treatment.

The soldiers are members of the Waterloo-based 1st Battalion 133rd Infantry Regiment. They have been in Afghanistan since October and are expected to return home later this summer.