Polio vaccines arrived in Gaza on Monday, kicking off an expansive effort to vaccinate more than 640,000 Palestinian children and curb a potential outbreak, the United Nations, Israel and health authorities in Gaza said, after the first confirmed case of the disease in the territory in 25 years.

The U.N. children’s fund, UNICEF, said it was bringing in 1.2 million doses of polio vaccine for children in Gaza in cooperation with the World Health Organization, the main U.N. agency that aids Palestinians, known as UNRWA, and other groups.

The Gaza Health Ministry confirmed on Monday that the vaccines had reached Gaza and that preparations to launch the vaccination campaign for children under 10 were underway. It was not immediately clear how quickly the vaccines could be distributed to vaccination centers in Gaza, where continued hostilities and bombardment have hindered humanitarian efforts during 10 months of war.

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