A Northport man was critically injured early Sunday morning after he lost control of his car and struck a tree in Hauppauge, Suffolk police said.

The driver, Douglas Caldwell, 47, of Layne Way, Northport, was driving a 2005 Nissan east on Veterans Memorial Highway at 4:10 a.m. when witnesses said the vehicle went out of control, police said.

The vehicle went into the center divider, hit a tree and flipped over, police said.

Police and bystanders tried to pull the man from the wreckage, but couldn't. Rescuers from the Commack Fire Department extricated him, police reported.

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The driver was taken to Stony Brook University Hospital, where he was listed in critical condition. His vehicle was impounded for a safety check.

Police ask anyone with information about this crash to call the Fourth Squad at 631-854-8452.