Authorities have arrested Dylann Storm Roof, the suspected gunman in a terrorist attack at a black South Carolina church.

The white supremacist was captured during a traffic stop in Shelby, North Carolina — about 30 miles west of Charlotte.

Police were tipped off by a concerned motorist who spotted a suspicious vehicle.

Descriptions and photos of Roof and his vehicle, which displayed a distinctive Confederate States of America license plate on the front bumper, were circulated widely in the hours between the massacre and his arrest about 11 a.m.

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Authorities said Roof cooperated with the officer who stopped him.

He is suspected of killing nine people at a Charleston church Wednesday night, and police do not believe any other suspects were involved.