Activist Thomas Sommer says the Dignity al-Karama ship is traveling slowly in international waters and aims to reach Gaza after daybreak Tuesday.

The Dignity left a Greek port late Saturday. It is the only ship to set sail so far from a larger protest flotilla that had hoped to break the blockade weeks ago but was thwarted by Greece.

Sommer spoke by telephone Monday from aboard the Dignity al-Karama. He is a spokesman for the 16 activists and journalists on the French-based ship.

The Israeli military has said it will stop any attempt to break the sea blockade of Gaza.