Sweden has rejected Greta Thunberg's plea for help on board the 'freedom flotilla' after Israeli commandos intercepted the vessel on its approach to Gaza.

Maria Malmer Stenergard, the Swedish Minister of Foreign Affairs, said on Monday that she believes Thunberg is not in need of support from the ministry after the climate activist called on followers to pressure the government into action.

'A great responsibility rests on those who choose to travel contrary to the advice given to a place,' she said outside the Swedish parliament, as protestors gathered in Stockholm to demand an intervention.

The minister lamented that, as a result of Greta's plea, the consular hotline had received a high volume of calls that meant Swedes 'in need' abroad were being held in long queues for assistance.

'It is quite dangerous to run a campaign that means that the Ministry of Foreign Affairs' consular hotline is called down,' she said, adding: 'The consequence is that Swedes in need abroad have to wait in line for far too long.'