CONCORD — A speeding teen driver lost control of his sport utility vehicle, jumped a sidewalk and struck a Concord family out for a morning bike ride Saturday, killing a father and his 9-year-old daughter and injuring his 12-year-old daughter, authorities said.

Solaiman Nuri, 41, and his younger daughter, Hadessa, were killed in the crash along Treat Boulevard, near Oak Grove Road, said Concord police Lt. Bill Roche.

Nuri’s older daughter suffered minor injuries not considered life-threatening and was treated at a hospital, Fire Marshal Lewis Broschard said. Authorities are not releasing her name at this time.

The driver in the crash — identified by friends as David Rosen, 17, of Concord — suffered minor injuries and was transported to a different Contra Costa County hospital, authorities said. He later was arrested on suspicion of manslaughter at the Concord police station, Roche said.

“Witnesses said the vehicle was traveling at an excessive rate of speed,” Broschard said.

Rosen will be held at Contra Costa County Juvenile Hall in Martinez this week while investigators consult with the District Attorney’s Office about the case, police said.

The accident occurred about 9:30 a.m., when the father and his two daughters, all wearing helmets, were on a regular family outing — riding bicycles along a Treat Boulevard sidewalk, Broschard said.

At that same time, Rosen, who was driving west on Treat Boulevard, swerved to avoid a car in front of him as he sped through an intersection and lost control of the white 2002 Cadillac Escalade, authorities and witnesses said.

The vehicle struck the bicyclists, sheared off a fire hydrant and careened into the brick facade of a single-story office building next to a fire station, authorities said.

Solaiman Nuri was pronounced dead at the scene.

As water gushed from the mangled hydrant, firefighters from a nearby station found Hadessa on the sidewalk, unconscious and not breathing. They performed CPR on her while she was transported by ambulance to John Muir Medical Center in Walnut Creek; the Woodside Elementary School student was pronounced dead there, Broschard said. The girl’s mother works as a trauma nurse at the hospital, a family member said.

Massood Sarwari, Solaiman Nuri’s cousin, arrived at the crash scene late Saturday afternoon. Sarwari said the family frequently went on bicycle rides together, and the sisters were both soccer players, describing them as “very close, almost like twins.”

“To see one pass away is just horrific,” Sarwari said. “What it would cause the other daughter, and the scar it would leave on her life for the rest of her life would be just unbelievable. … The whole family is just distraught.”

The father, who moved to Concord from Afghanistan more than a decade ago, coached his younger daughter’s under-13 girls soccer team, Aria Sports Club, a nonprofit serving the Afghan community across the Bay Area.

Friends of the family visited the crash site late Saturday, placing flowers and candles next to a tree. Hadessa’s teammate Marjana Akbar, 11, placed two lit vanilla-scented candles at the makeshift memorial, saying it was her friend’s favorite scent.

Susan Surls, a Concord woman who witnessed the crash, said the moments after the crash were chaotic. She first checked on the victims on the sidewalk, then approached the SUV’s driver.

Rosen stood next to the vehicle with a deployed air bag and told witnesses he was the driver.

“He just looked shocked to me,” she said.

After the crash, Rosen called his friend Adam Gartside, 18, of Walnut Creek, who lives within walking distance of the crash.

“He said he’d lost control, and he may have killed some people,” Gartside said. “He was frantic, in shock. It was really hard to believe.”

Rosen attends Olympic High School, a Concord continuation school, since graduating from Pleasant Hill Middle School. He lives with his parents in Concord and is unemployed, spending his free time fixing up his SUV, which he owned for about six months, with custom wheels and an expensive sound system, Gartside said.

Zuhair Bhatti, a clerk at Cork ‘N Bottle liquor store across the street from the crash, said the teen driver came in his store nearly every afternoon to buy soda.

“I was working, and I heard the crash and people screaming,” said Bhatti, who ran across the street to help. “The kids were on the ground — one screaming and one (who) wasn’t awake.”

Authorities said they are investigating the crash, which occurred in a 45-mph speed zone, but one witness said the driver raced through the intersection and flipped numerous times.

“He was trying to make the light,” said Ty Ross, an employee of Oil Changers at that intersection. “The guy was speeding down the street and hit the guy and his daughters.”

A city engineer was at the scene Saturday to evaluate the structural integrity of the building where the vehicle crashed, Broschard said.

Staff writers Tony Hicks and Rick Hurd contributed to this report. Contact Chris DeBenedetti at 925-945-4774.