UPDATED, 10:36 p.m.: According to State Police, the victim was taken to assachusetts General Hospital with life-threatening injuries. All lanes have reopened. State Police are investigating the crash.
UPDATED, 10:30 p.m.: Massachusetts State Police have confirmed the incident via their Twitter feeding saying it involved a tractor trailer truck.
State Police are responding to reports of a pedestrian struck by a car on Route 128 north near the Route 20 overpass, according to Twitter and scanner reports.
The State Police Photograph and Reconstruction units have been requested to the scene.
Stay tuned to Waltham Patch for more information as it becomes available.