It happened at a PG&E training facility at 9:54 a.m., according to PG&E.
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Police say two people were on board and sustained injuries. Both victims were taken to the hospital.
PG&E says the contractor helicopter, a Bell 407, was performing training when the crash occurred.
Firefighters say one person was inside the helicopter and had to use tools to get the person out.
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The Federal Aviation Administration and National Transportation Safety Board will investigate the crash.