Story highlights More than 30 pedestrians were hit

Witness describes a chaotic scene as people fled

"I saw a car up on the sidewalk coming toward us," she says

(CNN) [Breaking news updates]

11:50 p.m. ET: The driver is in custody and is undergoing various tests, including one for alcohol, authorities said.

11:45 p.m. ET: Officials don't yet know whether it was an accident or intentional.

11:44 p.m. ET: At least one dead and seven in critical condition, fire officials said. There were a total of 37 patients.

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