US Secretary of State Marco Rubio says the US is "troubled" by the humanitarian situation in Gaza. At least 140 Palestinians were reported killed since Thursday in Israeli air strikes, according to Gazan health officials. Gaza has been under a complete Israeli blockade of all food and other humanitarian supplies for 10 weeks, and Israel has intensified its bombardment ahead of a planned expansion of their ground offensive in Gaza. The US is Israel's main arms supplier and the language used by