Activists behind a flotilla intercepted at sea by Israel last year while attempting to deliver humanitarian aid to Gaza announced on Thursday they will try again, with plans to more than double the number of boats and carry hundreds of medics.

The Israeli military halted the roughly 50 boats in the Global Sumud Flotilla last October as they attempted to reach blockaded Gaza, arresting Swedish activist Greta Thunberg and more than 450 other participants.

The announcement of the new mission was made at the Nelson Mandela Foundation in South Africa and speakers included Mandla Mandela, grandson of the late former South African president.

Organizers said they hope to bring 100 boats for their next attempt and described the upcoming mission as the biggest civilian-led mobilization against Israel's genocidal actions in Gaza.

They called on the international community to prevent Israeli forces from intercepting the operation.