Hundreds of Australian and US contractors have today been prevented from entering the top secret Pine Gap spy base by pro-Palestinian protesters, reports say.

The demonstration involves two boats blocking the access road, "linking it to the growing waves of global aid flotillas," according to a statement by the protest group.

Photos released by activists showed two people locked onto a concrete barrel, sitting arm in arm, blocking the road beside two boats and local residents.

They succeeded in blocking 800 contractors from entering the base, organisers of the protest claimed.

Pine Gap, a joint US-Australian signals surveillance facility, is about 20km south-west of Alice Springs in the Northern Territory.

Activists say the installation has played a key role aiding Israel's militar

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