Renewed efforts to administer a second dose of a polio vaccine to children have begun in northern Gaza, a spokeswoman for UNICEF confirmed to dpa on Saturday. The spokeswoman noted that a humanitarian pause in fighting agreed to facilitate the campaign was restricted to Gaza City, warning health workers were unable to reach some 15,000 under the age of 10 in northern Gaza. Thousands of residents had brought their children to the medical centres set up in northern Gaza by the afternoon to have them vaccinated, medical sources in Gaza said. Some 119,000 children in northern Gaza are supposed to …