Jihad Misharawi, of BBC Arabic, cradling the body of his 11-month-old baby Omar At least 20 children have been killed  in the latest air strikes by Israel on the Gaza strip One UN teacher was killed last week  and at least 20 children have been killed in the Israeli attacks on the besieged area of Gaza, together with at least 80 adults. Hundreds have been injured, with hospitals struggling to cope. In scenes reminiscent of Operation Cast Lead at the end of 2008,  when about 1400  Palestinians were killed, many of them children, missiles are raining down on the densely populated Gaza strip. Then as now the casualty figures were grossly dispropportionate with four Israelis killed in the last conflict and three so far in this. The Israelis have the fourth most powerful defence forces in the world.The people of Gaza have been under siege since 2006 when they elected a Hamas government in free and fair elections - with the Israeli army controlling the sea, the air and land crossings. More than half of the residents of Gaza are under 18 and of those one in five is suffering from Post Traumatic Stress Disorder. Many schools were destroyed during the 2008/9 attacks and thousands of the residents of Gaza still live in poverty, relying on food aid. Meanwhile, uneployment among young people is at 58%, while students are refused permission to travel abroad to study. The UN relief agency (UNRWA) teacher, Marwan Abu El Qumsan, was killed last Wednesday in an air strike. UNRWA has closed all its schools as a result of the escalating violence. Many trade unionists and teachers around the world are sending solidarity and demonstrating for the Palestinians of Gaza. One way of sending support is to add your name to a statement at this website.