Baghdad (CNN) -- A U.S. service member was killed Wednesday in southern Iraq, the U.S. military said.
No other details, including the identity of the service member, were released. The incident is currently under investigation.
The American death was the sixth this week. Five service members were among 26 people killed Monday in a series of explosions across Iraq, including a suicide bombing in Tikrit that killed 11.
Monday's U.S. death toll was the highest in a single incident in two years. The deaths this week came after the United States has drastically cut troop strength in Iraq. About 47,000 U.S. troops remain in the country, down from 170,000 in 2007, during the peak of sectarian violence in Iraq.
U.S. troops have transitioned from a combat role to a support role in Iraq, training Iraqi soldiers and helping secure the country's borders and airspace.