Security is on high alert as Monday's Boston Marathon approaches.
Local, state and federal authorities collaborate annually on an extensive security plan.
Police barricades in Boston are already installed.
Both uniformed and plainclothes police officers, state troopers and federal agents will saturate the area.
Among prohibited items along the race route, backpacks, coolers, costumes, inflatable items, fireworks, bicycles, scooters, strollers and drones.
(Photo by Paul Rutherford/Getty Images)
Photo: Paul Rutherford / Getty Images Sport / Getty Images