SAN RAMON, Calif. -- A 10-year-old boy was struck and killed by a shuttle bus Friday while riding his bike in his suburban neighborhood in San Ramon, police said.

The incident occurred around 3:30 p.m. at Montevideo and Veracruz drives where the boy was riding his bicycle on the sidewalk, Sgt. Eric Webb said. He rode his bike off a corner where a curb lowered down to the street, he said.

At that time, the bus started up and the front end of the vehicle struck the boy's side and drove over him, said Webb.

Leticia Mitchell was standing nearby during the accident, and rushed to try to help the boy.

"The little boy was still breathing and I just held his hand and told him hang on," she said. "I was just with him, I was by his side."

The boy was transported to a local hospital where he was pronounced dead.

San Ramon Mayor H. Abram Wilson said the road isn't considered dangerous.

"Is this in any way an unsafe street? I don't believe so," he said. "But I right now am concerned about the family and after we make sure the family is taken care of, then we will deal with anything else."

There were two passengers onboard the bus when the accident occurred but there were no other injuries, according to Webb. The driver of the vehicle was "extremely cooperative," he said, and volunteered to have his blood tested to prove alcohol was not a factor.

"It wasn't a hit," said Mitchell. "He rolled down and she was more like pushing him over. She didn't hear him or see him, he just rolled under the car and ended up getting crushed."

The family of the child, who live just a few houses down from where the accident took place, have been informed of the accident by police.