(Michigan City, IN) - Michigan City Police are still investigating a serious injury head on crash with a semi-truck.

Police said it appears a passenger vehicle was being driven erratically and at a high rate of speed before veering over the center line into the path of the oncoming semi.  The driver of the passenger vehicle was taken by helicopter to a hospital in South Bend.  Police described the injuries as life threatening.  The driver of the semi was also hurt with injuries that were not life threatening, police said. 

The crash happened Wednesday about 6:30 p.m. on U.S. 12 on the city’s west side.  Police said whether alcohol or drugs were involved is not known but they have not been ruled out as possible factors in the crash.

The names of the drivers have not been released.