Seattle, Washington - Three additional U.S. soldiers based in Washington state are facing charges in the deaths of three Afghan civilians between January and May and have been placed in pre-trial confinement, the Army announced Wednesday.

Pvt. 1st Class Andrew Holmes, 19, from Boise, Idaho; Spc. Michael Wagnon, 29, from Las Vegas, Nevada; and Spc. Adam Winfield, 21, from Cape Coral, Florida, each face one count of murder under the Uniform Code of Military Justice. All three are stationed at Joint Base Lewis-McChord, near Seattle, and each soldier is suspected in separate incidents, the Army said in a statement announcing the charges.

Earlier this month, Spc. Jeremy Morlock, 22, from Wasilla, Alaska, and Staff Sgt. Calvin Gibbs, 25, from Billings, Montana, each were charged with three counts of murder and one count of assault. Lt. Col. Tamara Parker, an Army spokeswoman, said the three counts of muder Morlock and Gibbs face involve the same victims as the cases agaisnt Holmes, Wagnon and Winfield.

Morlock is in pre-trial confinement at the base, while Gibbs was charged in Kuwait and he is expected to return to the installation within days, the Army said.

All five soldiers are assigned to B Company, 2nd Battalion, 1st Infantry Regiment, 5th Stryker Brigade Combat Team, 2nd Infantry Division. The soldiers deployed with their unit to Afghanistan in July 2009, the Army said.

The Army says the investigation into the deaths is ongoing.