A suspicious package at 15th and K Streets NW has prompted police and hazardous materials responders to close off McPherson Square. The package in questions is reportedly some containers placed near a dumpster that appear to contain a chlorine-like substance. One reader tells us that fire trucks are lined up along 13th Street and that the MPD are clearing people out of the park. We’ll update when we learn more. More: Current street closures due to the haz mat investigation are 15th and K St. NW; 14th and New York Ave. NW to Vermont Ave, to 15th St.; and, 15th and I St. NW.

Update: Kyle Gustafson visited the site and took some photos of the activity.