MALDEN (CBS) – A water main break has slowed down the morning commute on Route 1 near the Malden-Revere line.

Water started pouring out onto the northbound lanes around 3 a.m. near the Lynn Street exit.

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The water main break on the Revere-Malden line on Route 1. (WBZ-TV)

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Maintenance crews shut off the water supply, but only one lane of traffic was getting by for rush hour. All ramps in the area were closed.

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There’s no word yet on what caused the break.