01:32 - Source: CNN
Army helicopters crash in Washington

Story highlights

The accident occurred in a training area at the base

"We will conduct a thorough investigation into this incident," a military official said

CNN  — 

Four Army aviators were killed in an accident involving two Army helicopters at Joint Base Lewis-McChord in Washington state Monday night, military officials said.

The crash, which involved two OH-58 Kiowa observation helicopters, occurred inside a training area at the base at about 8 p.m P.T., military officials said in a statement.

“Our thoughts and prayers go out to the family, friends and loved ones of the soldiers involved in this tragic accident,” said Maj. Gen. Lloyd Miles, acting senior Army commander at the base. “We will conduct a thorough investigation into this incident.”

CNN affiliate KCPQ-TV: Four killed in Army chopper crash

The names of the dead were not released pending notification of the victims’ families.

CNN’s Samuel Gardner III, Scott Thompson and Mike Ahlers contributed to this report.