Authorities say Hurricane Gordon has passed Portugal's mid-Atlantic Azores Islands without causing major damage and is losing strength.

The head of the Azores Civil Protection Service, Pedro Carvalho, says there were no reports of significant damage as Gordon passed by Santa Maria and Sao Miguel, two of the archipelago's nine islands, Sunday night.

He told public broadcaster Radiotelevisao Portuguesa on Monday that emergency services responded to some calls about localized flooding amid torrential rain. Nobody was reported hurt.

Authorities had warned locals to take precautions ahead of the arrival of the hurricane, which formed Saturday.

The U.S. National Hurricane Center in Miami said Gordon was expected to keep weakening and become a post-tropical cyclone later Monday.