Israeli air raids in the Gaza Strip killed more than a dozen people overnight into Saturday, hospital and local authorities said, as health workers were wrapping up the second phase of an urgent polio vaccination campaign designed to prevent a large-scale outbreak in the territory. The vaccination drive was launched after health officials confirmed the first polio case in the Palestinian enclave in 25 years, in a 10-month-old boy whose leg is now paralysed. The nine-day campaign by the U.N. health agency and partners began last Sunday in central Gaza and aims to vaccinate 640,000 children unde…