serious condition. the fbi says no motives or suspects at this point. law enforcement sources says there are a number of active leads. overnight authorities searched an apartment in ravire, massachusetts. the explosive devices used were packed with nails, zippers, blades. doctors report removing ball bearings from patients. there have been at least ten amputations so far. doctors say they have never seen the scale of an attack like this in normal city hospitals. the doctors says they will find and bring to justice whoever is behind the bombings at the marathon. those bombings, again, killed three people, injured more than 140. investigators, they're combing through the evidence this morning. the fbi and boston police asking anyone who may have seen anything, heard anything suspicious, contact authorities. i'm here with cnn's pamela