mass testing is possible thanks to new so—called lateral flow tests made by the company innova. government says they're reliable, detecting more than 70% of coronavirus cases, but public health officials say they're concerned that may not be the case when used by people who are not properly trained. and others agree that great care must be taken. there will be some people who are falsely negative — that they have covid, and they'll end up spreading covid to their granny or granddad, and that could be a disaster. it's the last thing we want to do at christmas. but the government believes the tests can play a major role in preventing the spread of the virus. it says it will work with local authorities in tier 3 to help resource their plans. it's now told us, however, it's not expecting to see the liverpool mass testing scheme replicated up and down the country. sophie hutchinson, bbc news. iran's most senior nuclear scientist, mohsen fakhrizadeh, has been assassinated near the capital tehran. he was widely viewed by western intelligence agencies as being behind iran's alleged secr