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ÔÔThis is a big, huge chaotic scene with lots of agencies involved,ÕÕ said CHP spokesman Jerry Pierce of Monday's derailment in Hanford.

OAKLAND -- An Amtrak train out of Oakland carrying nearly 200 passengers derailed Monday after colliding with a big rig truck about 20 miles south of Hanford, authorities said.

At least 20 passengers suffered minor to moderate injuries, authorities said.

Kings County Assistant Sheriff Dave Putnam said the injuries were described as bumps, bruises, scrapes and possibly broken bones.

The crash took place about 12:25 p.m. when the driver of the tractor-trailer did not yield and hit Train 712, pushing two passenger cars and the locomotive off the tracks just south of Hanford, a farming town in the Central Valley, officials said.

The train traveled about 600 feet after the collision before hitting a switchback and derailing, said California Highway Patrol Officer Scott Harris.

After the crash, metal pieces from the truck could be seen inside the train, which was covered by cotton seeds. Several pieces of luggage were scattered about.

As many as 13 of the injured passengers were taken to Adventist Medical Center in Hanford, said hospital spokeswoman Christine Pickering. She did not provide details on the extent of their injuries.

"We did call in additional physicians and staff," Pickering said.

Four additional injured passengers were taken to nearby Adventist Medical Center in Selma.

"There are no initial reports of serious injuries to Amtrak passengers and crew aboard the train," Amtrak officials wrote in a statement released shortly after the crash. "We are saddened by any injury and appreciate the emergency response by local and state agencies."

Both representatives from Amtrak and BNSF Railway, the railroad owner at the location, visited the scene.

The crash occurred at a public crossing that was equipped with control gates, he said.

The train, carrying about 169 passengers and four crew members, was on its way from Oakland to Bakersfield. It had four rail cars and a locomotive.

The truck driver suffered minor injuries, according to CHP spokesman Jerry Pierce. The CHP is investigating the crash.

Pierce said the other passengers were taken to an auditorium in Hanford, where they were expected to board another train and continue to their destinations or be picked up by family members.

A few hours later, a second crash involving a truck and train occurred a few miles away, the Hanford Sentinel reported.

About 3:50 p.m., a freight train and a silage truck collided on Grangeville and 4th avenues, the newspaper reported, but only minor injuries were reported.

The truck was delivering feed to a nearby dairy at the time of the crash.

The unidentified truck driver, who sustained a large cut to the front of his scalp, was taken by ambulance to a Fresno hospital, the newspaper reported.

Authorities say no alcohol or drugs were involved, and the driver likely misjudged the train's distance and speed, according to the newspaper.

Anyone with questions about family and friends on the Amtrak train can call 800-523-9101.

The Associated Press contributed to this report. Contact Natalie Neysa Alund at 510-293-2469. Follow her at Twitter.com/nataliealund.