Authorities from the Brookhaven Town fire marshal’s office and Suffolk County police arson squad continued Monday to try to determine the origin and cause of last week’s blaze that raced through a section of Fire Island Pines, destroying four homes and damaging two others.

The Friday fire on the barrier island was reported shortly before 1 a.m. at a home on Ocean Walk, Brookhaven Chief Fire Marshal Chris Mehrman said in an interview on the day of the blaze. He said the fire was fueled by winds of up to 30 mph that caused it to quickly spread to two homes on Pine Walk and one on Cedar Walk.

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“The cause is undetermined and it’s still under investigation,” a Suffolk County police spokeswoman said in an emailed statement Monday.

Mehrman could not immediately be reached for comment on the progress of the investigation.

More than 15 fire departments battled the blaze for several hours before it was brought under control, with some firefighters having to be ferried across the bay to help.

Two firefighters were treated at the scene for minor injuries and a third was taken to a hospital after apparently experiencing an elevated blood pressure.

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There are about 700 homes — all linked by wooden walkways — located on the one square mile Fire Island Pines.