A drone has hit a US-owned gas storage tanker at Egypt's Mediterranean port of Damietta, maritime security firm Ambrey said on Wednesday, citing an initial assessment of the incident.

Port services firm Inchcape said in a separate message two gas tankers had caught fire at Damietta.

The drone hit floating storage tanker Energos Winter, causing a fire that then spread to another vessel, Gaslog Salem, three trading sources familiar with the incident said.

Two separate security sources said the cause of the blast was a drone strike.

The crew were evacuated and the fire had been brought under control, Ambrey said, adding that no party had claimed responsibility.