It happened at the marina on Mansion Avenue in the Great Kills section around 4:45 a.m.
Firefighters took more than an hour to get the fire under control.
The boats were badly damaged.
Two fighters suffered minor injuries while battling the fire. They were taken to Staten Island University Hospital North for treatment.
The fire was brought under control around 10 a.m.
The cause of the fire is under investigation.
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