By Robin Emmott, Joanna Plucinska and Yara Abi Nader BRUSSELS/WARSAW (Reuters) – Polish security forces fired water cannon at rock-throwing migrants on the border with Belarus on Tuesday, and NATO reiterated its support for Warsaw in a crisis that has left thousands stranded on the frontier in icy temperatures. Video footage released by Polish authorities showed migrants also throwing bottles and logs across a barbed-wire border fence, and using sticks to try to break through. Seven police were hurt in the violence, the latest in a crisis the European Union says is orchestrated by Belarus – an…

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