A car fire on the northbound side of the O’Neill Tunnel generated heavy smoke, forcing lane closures this afternoon, State Police said.

Just before 1 p.m. State Police reported that two lanes were closed prior to Exit 23 (Government Center). The Boston Fire Department responded to the scene, where a Subaru station wagon’s engine was burning, said fire department spokesman Steve MacDonald.

No injuries were reported, said MacDonald.

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Shortly after 1 p.m., State Police said all the lanes heading north had to be closed due to heavy smoke. A few minutes later, State Police reported that the fire had been extinguished and one lane had reopened.

All lanes were open again by about 1:30 p.m.

Traffic cleared shortly after the lanes reopened, said MacDonald.