National Grid crews were monitoring the scene of a now repaired gas leak that caused the Tuesday evacuation of three commercial buildings in Melville.

Police, Melville Fire Department and National Grid authorities were called to the scene at 685 Rte. 110 in Melville at about 1:10 p.m. Tuesday, a Suffolk police spokeswoman said.

Melville Assistant Fire Chief David Kaplan said firefighters detected high enough levels of natural gas to potentially cause an explosion in the building, along with buildings at 677 and 691 Rte. 110. They evacuated 15 to 20 people in total.

No injuries were reported, he said.

Kaplan said they ventilated the buildings and turned off the gas before turning the scene over to National Grid.

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The cause of the leak was unclear, a National Grid spokeswoman said, but had been located in the median of the road and has been repaired, she said. A crew will be on scene monitoring it until Wednesday morning.

Gas service had been restored to 677 and 691 Rte. 110, but it remained off at 685 Rte. 110.