Israeli shells have struck a UN school in the Gaza Strip, killing at least 19 people and wounding scores.<br /><br />Christopher Gunness, the UNRWA's spokesman, said the attack was a "source of universal shame" and blamed Israeli forces.<br /><br />Al Jazeera's Imtiaz Tyab reports from Gaza.<br /><br />Subscribe to our channel http://bit.ly/AJSubscribe<br />Follow us on Twitter https://twitter.com/AJEnglish<br />Find us on Facebook https://www.facebook.com/aljazeera<br />Check our website: http://www.aljazeera.com/
