Top US official McMaster visits Afghanistan after bomb attack

US National Security Advisor General H.R. McMaster arrived in Kabul on Sunday days after the American military dropped its largest non-nuclear bomb on Islamic State group hideouts in eastern Afghanistan, killing nearly a hundred militants.On his first visit to the country as President Donald Trump's envoy, McMaster said on Twitter he was set to hold "very important talks on mutual cooperation" with President Ashraf Ghani and other top officials.A statement from Ghani's office later said McMaster