LYNNFIELD (CBS) – A Market Basket tractor-trailer jackknifed on Route 1 South Tuesday morning, causing a major backup.

The crash happened just before 10 a.m. near the Lynnfield Tunnel. Massachusetts State Police said there were injuries.

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All southbound lanes had to be shut down after the tractor-trailer rolled onto a guardrail and began leaking fuel. Police said a heavy duty tow truck was headed to the scene.

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By noon, all southbound lanes had reopened, but the northbound left lane had to be shut down for guardrail repairs. There continue to be significant delays in the area.