Nigeria, May 24 -- A man was shot dead by United States Secret Service officers on Saturday evening after he opened fire at a security checkpoint near the White House in Washington, DC. The incident also left one bystander wounded, authorities confirmed. According to reports, the suspect approached a Secret Service checkpoint at the intersection of 17th Street and Pennsylvania Avenue shortly after 6:00 p.m. local time (22:00 GMT). Officials said the man pulled a firearm from his bag and began shooting at officers stationed at the checkpoint. In a statement, the Secret Service said officers immediately returned fire, striking the suspect, who was later pronounced dead at a nearby hospital. A bystander was also injured during the incident,...