potential charges against someone else are now pending. as for the context on another possible suspect, police will only say it involves the fbi and we now know that in the weeks and months leading up to the deadliest mass shooting in u.s. history, 64-year-old stephen paddock did extensive research and not just on the concert venue outside the mandalay bay hotel. investigators say he also did internet searches for the biggest open air concerts in the u.s. and for how crowded santa monica beach gets here in los angeles. his research included information on las vegas s.w.a.t. team tactics as well as exactly what weapons and explosives police in las vegas use. and police did confirm that a week before the mass shooting, he rented rooms at another venue in downtown las vegas that overlooked a different outdoor concert. police say they shooting from the mandalay bay hotel was well-planned and well hidden. >> there was no suicide note, nor a manifesto left behind, no