A service member was found dead inside his vehicle in the Pentagon parking lot on Tuesday afternoon, according to the Defense Department.

Officials with the Pentagon Operations Center arrived at the scene around 3:30 p.m. after receiving a welfare check request for one of its military members, according to Brig. Gen. Pat Ryder, Pentagon press secretary.

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When Pentagon police officers approached the vehicle, they found the service member inside apparently deceased, which was later confirmed by Arlington County Emergency Medical Services.

It’s not clear what the cause of death is, and DOD officials say an investigation is still open. The department has not publicly identified the service member.