SUNNYVALE, Calif. (AP) — A California man who authorities said drove his car through a crosswalk in a quiet Silicon Valley suburb, hitting seven people and injuring eight, is being held in jail on eight counts of attempted murder.

Sunnyvale Department of Public Safety Chief Phan Ngo said Wednesday that four people remain hospitalized with major injuries, including a 13-year-old Sunnyvale resident who is in critical condition. Six people were taken to area hospitals.

Ngo said there is no evidence linking Isaiah Joel Peoples, a 34-year-old Army veteran, to known terrorist organizations but that the crash appeared deliberate. Peoples was arrested after Tuesday's crash.

"Peoples did not slow down prior to the collision and appeared to accelerate as he moved into the crosswalk," he said, adding they do not have a motive.

The youngest victim was a 9-year-old boy who was treated and released with minor injuries. A 15-year-old boy was treated and released by paramedics. The 13-year-old is a girl, Sunnyvale Department of Public Safety Capt. Jim Choi has said.

Peoples' mother, Leevell Peoples of Sacramento, California, said Wednesday that she couldn't imagine any situation in which her mild-mannered son would deliberately crash into innocent people, other than something related to the PTSD she said he experienced after serving as an Army sharpshooter in Iraq.

"Unless the car malfunctioned, he would not have done that. He's like the perfect, model citizen," she said. "He's an Army vet, he's a good kid, never been arrested. I promise you: It was not deliberate. If anything, it was that Army."

Peoples, who is an auditor for the Department of Defense in Mountain View, received inpatient treatment for PTSD in 2015, his mother said.

The crash happened at a large intersection in an area of commercial strip malls that residents describe as a quiet suburb. Businesses and roads were back open Wednesday morning, and the police tape that had been put up to cordon off the area as officers investigated had been removed.

The only signs of the crash were skid marks on the sidewalk where the car swerved, and a dented tree that Peoples crashed into, muttering thanks to Jesus as he slumped over the steering wheel of a hissing car.

Don Draper, 72, said he was waiting in his convertible for the light to turn green when the Toyota zoomed by. Draper said he was so enraged that he marched over to the car.

"He wasn't hurt apparently, and he was mumbling over and over again, 'thank you Jesus, thank you Jesus, thank you Jesus' again and again," Draper said. "And at this point I realized I had to call 911."

Other witness statements matched Draper's recollection that the driver was speeding and drove directly toward the pedestrians without trying to veer away or stop before striking them in the city about 50 miles (80 kilometers) south of San Francisco.

But the driver's mother, Leevell Peoples, described him as a well-behaved son who treats everyone with respect and attends church on Sundays. Isaiah wouldn't even run a yellow light, she said.

"He basically probably has no friends but the people he works with," she said. "I'm just hoping the Army stuff wouldn't have caused this to happen. He doesn't have any seizures or anything."

She said her son graduated from Sacramento State University after returning from Iraq in 2007. But he did have "a bad episode" with PTSD about two years ago, and Peoples said her son told her he has been regularly taking medication since.

"Everyone in his family knows how cautious he is, and he would never do anything to hurt someone," she said.

Former housemate Chuck Herrera described Peoples as very quiet, someone who had to be coaxed into going out for drinks or dinner. But he said Peoples was polite and kind and sweet to Herrera's toddler son.

He recalls Peoples "always had a lot of pills," and had a cough.

"The guy I met was not someone who you think will hurt someone," he said. "My guess is something happened."

Police officers went to Peoples' apartment complex Wednesday. The FBI is assisting California officials in the investigation.

Leevell Peoples said the Army forced her son to retire because of his PTSD. Pentagon spokeswoman Lt. Col Carla Gleason confirmed Wednesday that he retired from the U.S. Army but provided no other details.

Draper said a victim landed in front of his car, with what appeared to be a bloody head wound.

"I saw a body flying through the air, and one of them was right in front of me," Draper said. "This woman was about 10 feet (3 meters) off the ground; I can see her feet pointing upward."

Some of the eight people injured were at a corner or on the crosswalk when the car hit them before smashing into a tree, Choi said.

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Williams and Har reported from San Francisco. Associated Press writers Olga R. Rodriguez in San Francisco contributed to this report.

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This story has been corrected to show 13-year-old victim is a girl.

