KABUL, Afghanistan (AP) — The Afghan soldier who killed a U.S. two-star general and wounded 15 other people hid in a bathroom with a NATO assault rifle then opened fire when a group of officers from international forces passed by, an Afghan military official said Wednesday.

As U.S. and Afghan officials investigated the attack Tuesday that killed, Maj. Gen. Harold J. Greene, the highest-ranked U.S. officer to be slain in combat since 1970 in the Vietnam War, authorities reported two other so-called “insider” attacks the same day.