text:  by snipers. He's been identified as 20-year-old Thomas Matthew Crooks. The focus is now on the investigation with many questioning the security arrangements. Here's Jenny Kumar. A lot of the fallout of this is questions around how a man with an assault rifle was able to take up position on a roof less than 200 metres from the former president. We heard from one eyewitness who told BBC that whilst he was at the rally he could see someone climbing up on the roof with a gun and he told the police and they just seemed...