WILMINGTON (CBS) – Two people were seriously hurt in a crash that shut down Interstate 93 in Wilmington briefly at the start of rush hour Monday morning.

State Police said a pickup truck hit a guard rail on the southbound side of the highway around 5:15 a.m. south of exit 41. It rolled over and hit a tree. Two men from Methuen, ages 50 and 38, were inside the truck. Both had serious injuries but were conscious, police said.

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This pickup truck rolled off I-93 south at the start of rush hour Monday morning. (WBZ-TV)

Both sides of the highway were shut down so a medical rescue helicopter could land. The 38-year-old passenger was flown to Tufts Medical Center in Boston. The 50-year-old driver was taken to Lahey Hospital and Medical Center. Their names have not been made public.

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All northbound lanes were re-opened after the helicopter left around 6 a.m. Two lanes were opened on the southbound side of the highway, but traffic was backed up for several miles. The final lane was re-opened around 6:40 a.m.

There’s no word yet on what caused the crash.

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No other information is available at this point in the investigation.