explosions killed three people, they imposed new restrictions on what spectators bring with them with the 26.2 mile course. according to wcvb, spectators carry clear plastic bags and no backpack oer coolers or blanket and no surveillance cameras along the marathon route. kurt schwartz, how did you widdle down the suggestions given to you and your team to this specific list? >> good afternoon. we have been -- the public safety community in the greater boston area has been meeting and planning for several months. we have partnered with local regional, state, and law enforcement agencies. we had members of our planning team travel to other cities and states and countries to look at the practices and other events.