UNITED NATIONS — The Israeli military and Palestinian militant group Hamas have agreed to three separate, zoned three-day pauses in fighting in the Gaza Strip to allow for the vaccination of some 640,000 children against polio, a senior WHO official said on Thursday.

The vaccination campaign is due to start on Sunday, said Rik Peeperkorn, the World Health Organization’s senior official for the region.

He said the campaign would start in central Gaza with a three-day pause in fighting, then…