A New Zealander involved in the latest Gaza-bound flotilla attempt says four other Kiwi activists have been kidnapped by Israeli forces. 

About 19 ships were reportedly intercepted near Greece.

MFAT says up to six New Zealanders were onboard - and Consular officials are trying to find out if any have been detained.

Activist Samuel Leason, who remains with the flotilla, says there are still dozens of boats loaded with aid, so the mission will continue.

He explained they want to break the illegal siege on Gaza and create a humanitarian corridor so aid can be taken in. 

LISTEN ABOVE