of course, all of this happening on memorial day weekend with the detonation happening before the annual memorial day concert on the u.s. capital's west lawn. this is a major event and this year included big names, including gloria estefan and colon powell and chairmans of the joint chiefs of staff martin dempsey. a lot of people scared out there. >> i can imagine. the nation is pausing on this memorial day to remember service members who gave their lives. ceremonies at arlington national cemetery will get under way. cnn will be watching. correspondent barbara starr is there, in fact with more for us. barbara. >> reporter: good morning, mikaela. we are here at arlington. it will open to the public in just under an hour and we expect of course every memorial day as we always see a great number of people american coming here to pay their respects to the nation's fallen here at arlington, 400,000 are interred here.