Israel will use more aggressive force in the future to prevent ships from breaking the sea blockade on the Gaza Strip, a top Navy commander told The Jerusalem Post on Tuesday.

"We boarded the ship and were attacked as if it was a war," the officer said. "That will mean that we will have to come prepared in the future as if it was a war."

The anonymous comment came the day after the Israeli Navy raided a flotilla of international aid ships headed to the Strip. Nine activists were killed in the raid, and dozens were injured.

The flotilla which arrived late Sunday night was comprised of six ships, and another two ships, including The Rachel Corrie, were expected to attempt to enter Israeli waters in the coming days.

Greta Berlin of the Free Gaza Movement said earlier Tuesday that a cargo boat was already on the way to challenge Israel's blockade of the Gaza Strip.

A second boat carrying about three dozen passengers was expected to join the first, she added.