BATH — A Brunswick man remained in critical condition Tuesday night following a crash on Route 1 in Bath Monday that also injured three other people.

Police said the accident occurred at 6:30 p.m. when a 2003 Acura rear-ended a 2008 Lincoln sport utility vehicle. 

Both vehicles were northbound on Route 1 near Witch Hill Road, when the Acura, which was traveling very fast in the four-lane section of road, slammed into the Lincoln, Bath Police Chief Mike Field said.

The Acura then lost control, hitting a road sign and flipping over.

Police say there were no indications of alcohol use at the scene, but blood samples were taken, as is customary in a serious crash.

A passenger in the Acura, Michael Mason, 21, of Brunswick, was taken by LifeFlight helicopter to Central Maine Medical Center with serious injuries. He remained in critical condition, a hospital spokeswoman said.

The driver of the Acura, Joseph Boyington, 22, of Brunswick, was taken to Maine Medical Center in Portland with serious injuries. He was listed in fair condition Tuesday night.

The driver of the Lincoln, Stephanie Thacker, 43, of Brunswick was taken to Midcoast Hospital in Brunswick as was her son, Adam Thacker, 11.

Once the investigation is complete, the information will be presented to the district attorney to determine if charges are warranted, Field said.

The accident forced police to shut down Route 1 in Bath for several hours between the New Meadows Road exit in West Bath and Bath.