ST. LOUIS (KSDK) - A bomb sniffing dog was one aspect of increased security at the US Eastern District of Missouri Courthouse in downtown St. Louis.

NewsChannel 5 crews saw federal security officers and the dog checking out vehicles parked along 10th street near the Thomas F. Eagleton United States Courthouse.

Security has increasedin Boston, New York and Washington D.C. since the Boston Marathon explosions Monday afternoon.