At least 13 Palestinians were killed and 15 wounded in Israeli strikes on a school sheltering refugees and a residential building in Gaza, the Palestinian news agency WAFA reported early on Saturday. At least eight of the dead were in refugee tents at Halima al-Sa’diyya School in Jabalia in northern Gaza, WAFA said. In a separate incident, five Palestinians were killed in an Israeli strike on a residential building in the Nuseirat camp in central Gaza. Health officials have resumedvaccinating tens of thousands of children in the enclave against polio, aiming to curb the spread of the disease i…