Aid flotillas like the one preparing to leave for Gaza would not be necessary if governments upheld international law, rights activist Greta Thunberg told AFP Saturday.

"It should not have to be up to us," said the 22-year-old Swedish campaigner, who will join the flotilla when it sets off from Barcelona on Sunday.

"A mission like this should not have to exist," she added.

"It is the responsibility of countries, of our governments and elected officials to act to try to uphold........

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