I-75 has been closed for hours in Monroe County, between Luna Pier and South Otter Creek.
Michigan State Police have taken into custody a gunman who locked himself in a auto on Interstate 75 near Luna Pier Road, officials said.
Michigan State Police report hostage negotiators are talking with the suspect. The northbound lanes have since reopened, but the southbound lanes are still closed as authorities are removing the man's vehicle from the road.
According to police, the Oakland County Sheriff's Office did a welfare check on the subject in Pontiac around 3:30 a.m. He is considered armed and risky.
According to the MSP Metro Detroit Twitter feed, the incident is on I-75 near Gaynier Road.
Drivers are being asked to use US-23.
All travelers are advised to avoid the area.