(EL PASO COUNTY, Colo.) — Southbound lanes of Highway 115 in southwestern El Paso County are closed after a minor was killed in a crash on Monday afternoon, June 9.

According to the Colorado State Patrol (CSP), troopers originally responded around 1 p.m. on Monday to a two-car crash near the El Paso/Fremont County line. CSP said initial reports indicate a Hyundai Ioniq and a Mack semi truck hailing a trailer collided, though the cause of the crash is under investigation.

The driver of the Hyundai was taken to the hospital by ambulance, and the passenger, a minor, was transported by helicopter. The passenger was declared dead at the hospital.

CSP said as of 5 p.m. Monday, the southbound lanes remained closed, and there is no estimated time of reopening. CSP said the closure is expected to last an “extended period of time” for the investigation.

If anyone witnessed the crash and has not spoken to investigators, you are asked to contact CSP at (719) 544-2424.