Greta Thunberg has insisted she is not anti-Semitic as she sets sail on her second 'freedom flotilla' to Gaza - nearly three months after she was deported on her first attempt.

The Swedish campaigner was detained by Israeli forces along with 11 others in June after they attempted to sail from Italy to the under-siege Palestinian enclave to deliver a symbolic amount of aid.

Their voyage was described by the Israeli foreign ministry as a publicity stunt by 'celebrity activists', referring to their flotilla - named the Madleen - as 'the selfie yacht'.

Thunberg claimed that Israel had 'kidnapped' the group in international waters and 'taken them against their will', after security forces intercepted the Madleen some 100 nautical miles from Gaza.

The activists, including Thunberg, were banned from Israel for 100 years, according to the rights group that legally represents some of them.