The U.S. military says a roadside bomb has killed an American soldier in south of Baghdad.

A statement says the blast that killed the soldier struck a vehicle that was part of a combat patrol near Iskandariyah.

The military says Wednesday’s incident is under investigation.

The statement says the soldier was assigned to Multi-National Division _ Center.

At least 4,173 members of the U.S. military have died in the Iraq war since it began in March 2003. That’s according to an Associated Press count.