Jerusalem - Israeli naval vessels thwarted the advance of a pro-Palestinian boat attempting to reach Gaza on Saturday in defiance of Israel's blockade of the territory, the military said.
The ships diverted the Estelle to the nearby port of Ashdod after passengers refused to steer the vessel off its course, the military said in a statement.
The 30 or so passengers on board did not offer resistance.
"A short while ago, Israeli naval soldiers boarded the Estelle en route to the Gaza Strip attempting to break the maritime security blockade," the statement said.
Victoria Strand, a spokesperson for Ship to Gaza in Sweden, which sent the Estelle, told the Associated Press that armed, masked soldiers boarded the boat and cut their communications as they were about 30 nautical miles from Gaza.
She said activists on board told her that some six naval boats surrounded their vessel.
"This is a demonstration of ruthlessness," Strand said.
The Swedish-owned, Finnish-flagged Estelle left Naples, Italy, on 7 October with about 30 people from eight countries, carrying items like cement, basketballs and musical instruments.
They were trying to challenge Israel's blockade, imposed since the militant group Hamas seized the coastal territory in 2007.
The ship was the latest in a series of activist-manned boats challenging Israel's blockade on Gaza. Activists have sent a series of blockade-defying vessels to Gaza, most of which have been similarly diverted to Ashdod.
In 2010, an Israeli naval raid on a Gaza-bound flotilla killed nine Turkish activists on board, sparking international condemnation that forced Israel to ease much of its blockade, although it maintains restrictions on key exports and imports of raw materials.