Activists say Israel's navy has begun intercepting a Gaza-bound aid flotilla

Ships that are part of the Global Sumud Flotilla heading to Gaza are anchored off the coast of of Sidi Bou Saïd in Tunis, Tunisia, Tuesday, Sept. 9.

The Global Sumud Flotilla, with Greta Thunberg, Nelson Mandela's grandson and European lawmakers aboard, includes some 50 boats and 500 activists and is carrying a symbolic amount of humanitarian aid.

(Image credit: Anis Mili)