Officials said 150 firefighters had been called to the scene. The flames aren't expected to spread to other structures, but officials have not yet declared the fire under control.

\"PHOTO:
Noah Berger/San Francisco Chronicle/Polaris
PHOTO: Smoke rises from Pier 45 as a fire burns on May 23, 2020.
>

No other boats were damaged, officials said.

Three businesses were affected by the fire, all of which -- blue and gold fleet offices, red and white fleet offices and Jeremiah O'Brien fleet offices -- are ferry or vessel services.

\"PHOTO:
Jeff Chiu/AP Photo
PHOTO: Fire officials work in front of a sign for Musee Mecanique after a fire broke out before dawn at Fisherman's Wharf in San Francisco, Saturday, May 23, 2020.
>

Officials haven't determined the cause of the fire but are investigating. Because of the fire's size, that's expected to take some time, they said.

The fire was first reported around 4:40 a.m., according to ABC San Francisco station KGO.

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