Three others were transported to the hospital in critical condition, the Los Angeles Fire Department said.

The SUV driver, a man in his mid-60s, was among the injured, LAPD Capt. Warner Castillo said. The department’s drug-recognition experts were at the hospital to determine if the driver was impaired, he said.

Police Tuesday night did not believe there was any other vehicle involved in the collision, Castillo said.

The LAFD said the three people who were killed were beyond medical help when first responders arrived and were declared dead at the scene.

LAFD Assistant Chief Joe Everett told reporters that an agency battalion chief came across the crash at around 6 p.m., “and what he found was a car that had careened into a number of people on the sidewalk.”

Everyone who was struck was on the sidewalk, LAPD Chief Jim McDonnell said, noting that the investigation was still in its early stages.

Los Angeles Mayor Karen Bass said that the people struck were pedestrians and vendors. She said her office is coordinating with city departments and authorities to determined the cause of the crash.

“I’m heartbroken for the families of everyone impacted. We will continue to provide updates as more information becomes available,” Bass said.

Aerial video from NBC Los Angeles showed what appeared to be a white vehicle crashed into the side of the Metro station, which houses escalators and stairs that go down to the subway, and debris scattered over the area.

A witness said that two women selling hot dogs were thrown in the air from the impact, the station reported.

It was not clear how fast the vehicle was traveling, and investigators will be looking at video and interviewing witnesses, McDonnell said.

“It’ll be probably a prolonged but very deliberate investigation to determine what happened here, and our hearts go out to the families of the victims that were struck here tonight,” he said.