A man stopped for traffic offenses Sunday by Mount Rushmore National Park rangers reportedly shot and killed himself during an hours-long standoff.

The New Mexico man’s identity was not released.

The incident began around 8 p.m. on Highway 244. During the traffic stop, the man pulled out a handgun and retreated to his van, barricading himself inside. According to a release from the Pennington County Sheriff’s Office, the man made statements that he wanted to hurt himself.

The Special Response Team was called out and negotiations continued until 2:30 a.m. Monday, when the man shot himself.