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It's 9 months since the group known as Islamic State was defeated in its stronghold of Mosul in northern Iraq. But it's still not clear how many civilians were killed in the battle. Estimates vary from more than a thousand -- to more than 10 thousand -- many of them reportedly killed in coalition airstrikes. So far -- only the US and Australia have accepted any responsibility for civilian deaths -- here, the Ministry of Defence says it's seen 'no evidence'. Our defence correspondent Jonathan Beale reports