The number of Palestinians killed in the Gaza Strip has risen to 20,057 since the start of Israeli bombardment of the territory in October, Hamas-controlled health authorities said on Friday. In the past two days, some 390 people were killed, the Health Ministry in Gaza said. A total of 53,320 people have been injured, including thousands of children. The figures cannot be independently verified, but the UN and observers point out that the authority’s figures have proved to be generally credible in the past. The Israeli military offensive in Gaza was triggered by the worst massacre in Israel’s…