Crews train for extreme emergency operations

Training started Saturday morning in more than a dozen cities.

In Hayward, crews practiced rappelling down the side of a building at Cal State East Bay.

Other exercises in the area include a mock airplane hijacking in Oakland, a bridge assault in San Francisco and chemical sabotage in Castro Valley.

The training helps officers gain individual tactical skills and also helps departments coordinate resources.

The exercises are going on across the nation as part of homeland security training.

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