A school bus and an SUV crashed in the O'Neill Tunnel on Thursday morning causing massive traffic delays.
Massachusetts State Police said there were no children on the school bus and both drivers were uninjured.
The vehicles came to rest on Interstate 93 southbound, causing all lanes to be blocked. The Massachusetts Department of Transportation said traffic was backed up all the way to Wilmington at one point, which is more than 15 miles from the accident scene. Commuters were advised to use alternate routes or mass transit due to the backup.
State police and tow operators were able to get one lane open about 20 minutes after the crash and the rest opened a few minutes later.
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The SUV, a Lexus RX350, was operated by 52-year-old Thomas P. Wells, of Saugus.
The bus was operated by a 60-year-old Randolph man.
State Police cited Wells as the cause of the crash but did not have the exact charges yet.