Five people were injured following a serious multi-vehicle car crash just after 2:30 p.m. Friday afternoon near the Tyngsboro Bridge.
The collisions took place near the intersection of Middlesex and Kendall Roads, prompting nearby road detours for several hours.
One passenger among the five injured was flown to a Boston hospital due to the extent of their injuries, police said.
Witnesses reportedly told police a white Honda Civic was seen travelling erratically just before the accident.
Investigators ask any witnesses to call Sgt. Cynthia Shay at (978) 649-7504.