Three Brandeis University students were struck by a car and seriously injured Sunday night while crossing South Street, which bisects the Waltham campus, police said.
The students — an 18-year-old man, 18-year-old woman, and 22-year-old woman — were in a crosswalk when they were hit by a car headed north, said Sergeant William Gallant of the Waltham Police Department.
Two of the victims had head injuries, Gallant said. The third victim was unconscious when responders arrived, he said. All three students were found in the roadway. The three were taken to Beth Israel Deaconess Medical Center, where they were in serious condition.
The driver, a 42-year-old man from Belmont, stopped at the scene, Gallant said.
He was heading north on South Street, a dark, curvy roadway running from one side of the university to the next, when the crash occurred about 6:25 p.m.
The cause of the crash remained under investigation, and Gallant said speed has not been ruled out as a factor. No charges had been filed against the driver, who was not named.
Police did not identify the victims Sunday night, and a spokeswoman for the university declined to comment.
No further information was immediately available.
Globe Correspondent Zachary T. Sampson contributed to this report. Nicholas Jacques can be reached at email@example.com.