Officials said the suspect approached a security checkpoint carrying a bag before producing a firearm and opening fire on officers stationed in the area. US authorities have identified the individual involved in the shooting outside the White House on Saturday as 21-year-old Nasire Best, according a a report by NBC News quoting law enforcement sources. The report added that Best had a history with law enforcement and was battling "mental health" issues. According to the authorities, the gunman opened fire on United States Secret Service officers near the White House on Saturday evening before being shot dead by agents. The...