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SAN FRANCISCO — A truck struck two elderly pedestrians in San Francisco on New Year’s Day, leaving one of them with life-threatening injuries and the other in critical but stable condition, a police spokeswoman said Monday.

There were no indications that the incident about 3:30 p.m. at Geary Boulevard and 21st Avenue was a terrorist attack, San Francisco police Officer Grace Gatpandan said.

It also does not appear as if the male driver was inebriated or stoned, including on marijuana, she said. Pot became legal for the first time in California on New Year’s Day.

The 20-foot-long white truck was making a turn onto 21st Avenue from Geary when the driver appeared to over-correct, hitting a Mazda sedan with a family of five inside and the two elderly pedestrians.

Both were being treated Monday night in area hospitals.

The driver was cooperating with the investigation, Gatpandan said.