Greece ? Crewmen fired high-pressure water jets Friday to fight off heavily armed Somali pirates trying to board a Greek oil tanker in the dangerous Gulf of Aden, officials said. It was the fourth pirate attack of the new year.

Armed with guns and rocket-propelled grenades, pirates in three speedboats twice tried to board the Greek-flagged Kriti Episkopi but were driven away when the crew turned fire hoses on them and EU aircraft scrambled from a nearby European Union naval flotilla to help, shipping company and Greek government officials said.

The attack came a day after Somali pirates seized an Egyptian cargo ship and its 28 crew in the waterway, one of the world’s most important sea routes. Also Thursday, a Malaysian military helicopter saved an Indian tanker from being hijacked and a French warship thwarted an attack on a Panamanian cargo ship and captured several pirates.