The westbound Massachusetts Turnpike was blocked for nearly two hours by a rolled-over truck near I-495 on Thursday, officials said, snarling traffic ahead of rush hour. The incident near the Hopkinton/Westborough line at about 2:30 p.

All three lanes were opened about 4:30 p.m. The crash, just east of the interchange, occurred about 2 p.m. Thursday. State police and emergency crews from Westborough were among those on the scene. Firefighters worked to contain a fuel leak.

The Massachusetts Turnpike is closed after a truck rolled over, causing injuries and spilling hazardous materials on the road on Thursday, first responders said.