A number of first responders are at a multi-vehicle crash on
I-495 North at this hour, according to a numerous reports.
A number of reports are Twitter put the accident at just before Exit 34. At least one car rolled over onto its roof.
Fire and rescue teams from both Westford and Chelmsford responded to the scene.
There are unknown injuries at post time.
Westford Patch will follow up this post with more information as it becomes available.