UPDATED: Overturned Tanker Released More Oil Than Originally Thought

UPDATED, 12:25 p.m.: The majority of the 10,000 gallons of oil in the tanker that overturned Friday afternoon was released from the vehicle and into the nearby area and the Mystic River, according to Massachusetts State Police. 

This is much more than the 1,000 gallons of fuel estimate that was reported by State Police Friday night.

Though the roadway has been opened this morning, police warn motorists that there may be scattered closures as haz-mat teams continue to work in the clean-up of the area and river.

Some of the roadway was removed and repaved Friday night and early Saturday morning, said State Police. 

State Police said there were conflicting reports at the time of the type of fuel spilled from the vehicle. The substance was actually oil, State Police said Saturday.

The 65-year-old driver is still in serious condition at Beth Israel Hospital. Police have not filed charges at this point or identified the driver. 

Original post at 9:40 a.m. Saturday:

Medford Street and Mystic Valley Parkway reopened at 9 a.m. Saturday morning nearly 17 hours after

Crews worked overnight and the clean-up continues on the Mystic River and surrounding areas.

In a press release, the town of Arlington said clean-up efforts may last throughout the weekend and warned that the work could cause delays in the area of the Medford Street rotary on the Arlington/Medford line where the crash occurred on Friday afternoon.