Washington ? A woman plowed her car through a crowded street festival Saturday night, injuring about 35 people, including two police officers who drove their motor scooters into her path attempting to stop her, authorities said.

Police said seven of the victims, including two children under age 3, suffered major injuries.

Officers caught up with the driver, whom they identified as Tonya Bell, 30, of Oxon Hill, Md., about a block away from the festival. She was arrested and charged with aggravated assault while armed. District of Columbia Police Chief Cathy L. Lanier said additional charges are pending.

Police said Bell had a 7-year-old child in the car with her.

They were conducting blood tests that would show whether alcohol or drugs were involved.

“We’re still trying to piece together exactly just what happened that led up to this,” Lanier said at the scene.

She said a vehicle believed to be Bell’s was driving erratically and struck a police car and fled the scene about a half-hour before the crash at the festival, which occurred about 8 p.m.

Alan Etter, a spokesman for the District of Columbia fire department, said authorities believe Bell was going about 70 mph when she came through the festival.

David White, president of the Chicago Shannon Civic Association, said Bell grew up in the neighborhood and is well known.

White said he and other residents saw her in the area on Saturday morning, driving erratically and clipping parked cars.

He said he confronted her, but she acted like she didn’t know him.

“I said, ‘Tonya, what are you doing?’ She was sweating like a race horse. We tried our best to stop her. … She was just in a deranged state of mind,” White said.