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Japan's sanctions include a ban on entry by the North Korean ferry Mangyongbong-92.

The measure forced about 1,000 Korean residents to cancel trips to North Korea or to instead fly to the hermit state by a roundabout route, because the ferry is the only direct passenger link between the two countries, which have no diplomatic ties, according to Chongryun.

The participants also tried to hand passersby fliers that claim the sanctions infringe on the human rights of Koreans, who are in Japan as "neighbors" and "residents."

They were also seen carrying a placard that said, "We do not condone assaults and harassment against young pupils and students at Korean schools."

The groups said they plan to continue the sit-in through Sunday.