LOWELL -- Police are investigating three unrelated accidents that sent three pedestrians to the hospital with serious and potentially life-threatening injuries on Tuesday.
The first crash was on Rogers Street near Park Street at 7:25 a.m. That crash sent a 76-year-old man who was struck by a car to a Boston trauma center via a MedFlight helicopter.
Hours later, about 3 p.m., a boy was struck by a Mercedes SUV on Wood Street, between Middlesex Street and Princeton Boulevard, and suffered what may be life-threatening injuries, police said.
A third pedestrian, this time a female in her late teens or 20's, was struck by a motorcycle while crossing the inbound lanes of VFW Highway just before Aiken Street, about 8:30 p.m.
The female pedestrian was flown to a Boston trauma center via MedFlight, while the male who was driving the motorcycle went to Lowell General Hospital.
Police said the motorcycle driver remained conscious at the scene, but the female was more seriously injured. It was not immediately clear if her injuries were life-threatening.
The Lowell Police Traffic Unit is reconstructing all three accidents, all three of which caused extended road closures in the areas where they occurred.
Follow Robert Mills on Twitter and Tout @Robert_Mills.