SEATTLE (AP) - The father of a U.S. soldier serving in Afghanistan tells The Associated Press he tried to warn the Army that troops in his son's unit had killed civilians.

By the time suspects were arrested in May, two more Afghans were dead.

Christopher Winfield says his son Adam was so disgusted after the first killing that he sent Facebook messages home asking for help. Winfield says he called Fort Lewis and a military hotline asking officials to investigate - to no avail.

Now his son is one of five soldiers charged in case. His son's attorney says Spc. Winfield was ordered to shoot at the third victim, but deliberately shot high.

An Army spokeswoman declined to comment about whether the base received any tips about the case.

Winfield provided phone records showing the calls, but the AP could not independently confirm what was said during them.