At least four persons were gunned down, when unidentified gunmen opened fire in Kapcard Mall at Washington D.C. in United States of America (USA). The incident took place at midnight, last night. Police immediately reached the place and cordoned off the area, after vacating the mall of people. They are on the look out for the assailants. Panic stricken people were seen rushing out of the mall as soon as the gunshots were heard.