Israel said Wednesday's shelling and air strikes on Gaza targeted Islamist militants at dozens of sites across the enclave.<br /> <br />The United Nations said one of the places hit was this school it runs in Jabalya where people had taken refuge.<br /> <br />The U.N. Relief and Works Agency says 3, 000 were sheltering inside.<br /> <br />At least 19 were killed.<br /> <br />The Agency says about 125 more have been wounded.<br /> <br />The school in the Jabalya refugee camp came under fire around dawn.<br /> <br />Jabalya is the largest refugee camp in the Gaza Strip.<br /> <br />Its 120, 000 population has been swelled by more Palestinians trying to escape the latest eruption of fighting between Israeli forces and militant groups.<br /> <br />The U.N said on Tuesday it had found a cache of rockets at one of its Gaza schools.<br /> <br />It didn't blame any particular party but condemned those who it said had endangered civilians by putting them there.<br /> <br />An Israeli military spokeswoman said she had no immediate information about what
