A National Transportation Safety Board official climbs into the bus after a news conference Tuesday, Feb. 5, 2013, at Certified Towing in Ontario, Calif. The NTSB gave an update on the investigation of Sunday's tour bus crash near Yucaipa that killed seven people. (AP Photo/The Inland Valley Daily Bulletin, Jennifer Cappuccio Maher)
A National Transportation Safety Board official climbs into the bus after a news conference Tuesday, Feb. 5, 2013, at Certified Towing in Ontario, Calif. The NTSB gave an update on the investigation of Sunday's tour bus crash near Yucaipa that killed seven people. (AP Photo/The Inland Valley Daily Bulletin, Jennifer Cappuccio Maher)
Authorities work Monday Feb. 4, 2013, at the scene of Sunday's fatal tour bus crash on Highway 38 north of Yucaipa, Calif., that left at least eight people dead and dozens injured. The cause of the Sunday crash east of Los Angeles remained under investigation. (AP Photo/The Sun, Rick Sforza)
Skid marks from the weekend's fatal bus cash remain on the pavement as morning commuters drive along Highway 38 for the first time since the road was reopened, Tuesday, Feb. 5, 2013 in Yucaipa, Calif. The crash involved two other vehicles and left seven people dead and more than 30 people injured. The tour bus originated from Tijuana and was driving down from Big Bear Lake. (AP Photo/The Sun, Gabriel Luis Acosta) VENTURA COUNTY STAR OUT; RIVERSIDE PRESS-ENTERPRISE OUT; THE VICTOR VALLEY DAILY PRESS OUT
Authorities work Monday Feb. 4, 2013, at the scene of Sunday's fatal tour bus crash on Highway 38 north of Yucaipa, Calif., that left at least eight people dead and dozens injured. The cause of the Sunday crash east of Los Angeles remained under investigation. (AP Photo/The Sun, Rick Sforza)
Authorities work Monday Feb. 4, 2013, at the scene of Sunday's fatal tour bus crash on Highway 38 north of Yucaipa, Calif., that left at least eight people dead and dozens injured. The cause of the Sunday crash east of Los Angeles remained under investigation. (AP Photo/The Sun, Rick Sforza)
LOS ANGELES (AP) ? Investigators zeroed in on brakes as a possible cause of last weekend's deadly tour bus crash that killed seven people, including a 13-year-old boy from San Diego and his mother and grandmother.
Victor Cabrera-Garcia, Elvira Garcia Jimenez and Guadalupe Olivas were among 38 people on a daylong trip from Tijuana, Mexico, to see the snow in the San Bernardino Mountains. The bus crashed Sunday evening near Yucaipa as it made its way down meandering state Route 38.
Beginning a review that could take months, investigators from the California Highway Patrol and the National Transportation Safety Board started collecting evidence about the bus, road conditions, and possible driver error or fatigue that could have played a role in the crash.
A team of NTSB officials was dispatched Tuesday to the offices of bus operator Scapadas Magicas LLC, in National City, near San Diego, where they interviewed owners and employees and gathered documents on the vehicle's maintenance history.
The roadworthiness of the 1996 bus loomed as a key issue after the driver told investigators the brakes failed as it descended from the popular Big Bear ski area, and federal records pointed to a history of brake maintenance problems.
"We are going to look very closely at the brakes as we will every other mechanical system on the bus," NTSB spokesman Eric Weiss said.
The bus, its front roof collapsed and windows shattered, was towed to an auto yard in Ontario that the CHP uses to store evidence, Officer Mario Lopez said.
The CHP's criminal investigation, which is routine, is "to determine if there was any criminal action that caused this collision," Lopez added.
The bus careened out of control as it descended the mountain road, striking a sedan and flipping before slamming into an oncoming pickup truck hauling a trailer. The accident scene left even veteran investigators shaken, as debris and body parts littered the road. Dozens were injured and several remained in critical condition Tuesday.
Victor Cabrera-Garcia's aunt, Luz Garcia, told The Associated Press she believed the boy went to see the snow with his 40-year-old mother and 61-year-old grandmother as a late present for his Jan. 13 birthday.
"It's hard because we are suffering the pain from losing members from three generations," Garcia said, speaking in Spanish. "Each one hurts equally. It's horrible."
The boy was his mother's only son and they lived with his grandmother, Garcia said. He loved soccer and played on a local team as a goalie.
One of his happiest moments, she said, was when he got an autographed photograph of Tijuana's soccer team, which in December won the border city's first Mexican Apertura first division football title.
Others killed in the crash were Tijuana residents Liliana Camerina Sanchez Sauceda, 24; Aleida Adriana Arce Hernandez, 38; Rubicelia Escobedo Flores, 34; and Mario Garcia Santoyo, 32, authorities said.
Investigators will attempt to determine if a mechanical failure, driver error or a combination of both caused the crash. It will encompass a broad range of factors, from road conditions to witness accounts, an exhaustive review of the vehicle to an evaluation of the driver and his decisions. Investigators have also taken a blood sample from the driver.
Just before the crash, the driver, Norberto B. Perez of San Ysidro, shouted to the passengers that the brakes had failed and urged them to call emergency services, passengers said.
"If it didn't have brakes or did have brakes, it would leave different types of evidence," said Bob Snook, an accident consultant who recently retired from CHP after working on accident investigations for 25 years.
The investigations are "basically car autopsies, because they will go over that bus with a fine-toothed comb," Snook said.
Even skid marks need to be analyzed carefully to determine whether, for example, they were created by the bus trying to turn too quickly or braking hard, Snook said. Investigators found skid marks at the crash site.
A special six- or seven-member CHP investigation team is typically augmented by other specialists from the agency, whose expertise can range from roadway engineering to diesel mechanics, Snook said.
Government records showed the bus recorded 22 safety violations in inspections in the year ending in October, including brake, windshield and tire problems.
"They'll be very interested in prior contacts with this company, what prior violations they've had, which could be bad or extremely minor," Snook said. A violation can be a crack in the corner of a windshield all the way up to a broken wheel or axle falling off.
Chris Medwell, an expert in heavy vehicle accident reconstruction at Bloomberg Consulting in Gulf Breeze, Fla., said investigators typically focus on several issues when examining air brakes following a crash, including wear to parts and an adjustment device that compensates for wear. Filters on air compressors that feed the system can clog, and hoses can leak, among other mechanical problems.
But human error can also be at issue.
As the name implies, air brakes use pressurized air for stopping power, rather than the hydraulic fluid used in car brakes. Heavy weight in a vehicle, combined with an inexperienced driver in rugged terrain, can have risks.
"A lot of inexperienced drivers on long grade will pump the brakes. ... Descending mountain grades is a special skill," Medwell said. "You don't want to apply and release, and apply and release, to maintain a constant speed. That's what taxes the system."
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Associated Press writer Julie Watson in San Diego contributed to this report.
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