A man was stabbed and seriously injured Sunday night on the platform at the Ballston Metro station in Arlington , authorities said.

Two men were taken into custody in the 8:40 p.m. incident, and a knife was found, a Metro spokeswoman said.

The victim was taken to a hospital with life-threatening injuries, said the spokeswoman, Morgan Dye. It was not known what prompted the stabbing.

This report has been updated.

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