The third day of the Boston Marathon bombing investigation began with the name of the attack's third victim — as well as new public leads both officially and from the crowd — but as night fell on an evacuated federal courthouse in Boston, an alphabet soup of unnamed law enforcement officials had provided a promising if unclear picture of a "breakthrough" in the case: Investigators appear to have just that — a picture, from a new surveillance video at Lord & Taylor in Copley Square, that appears to show a man leaving a bag at the scene of the crime. But NBC News, which showed restraint in a day of swirling unformed reports, reported that there was no name for this person. There has been no arrest — that much was clear from the Boston police, the U.S. district attorney's office, and a stern warning from the FBI. Local reports said an arrest was "imminent," the Boston Globe reported that investigators were "very close," the Los Angeles Times reported that the video pointed to two suspects, and CBS News's Bob Orr reported the video showed "a white man placing a backpack on the ground while talking on a cell phone." This followed CNN and Fox reporting, falsely, that an arrest had been made, and that "a dark skinned man" was the "suspect." After all that, a bomb threat at the courthouse left hundreds of reporters gathered in the event some unconfirmed suspect made an appearance outside on the sidewalk and a nation in waiting.
- Per CBS News this evening, the photo of a possible suspect that appears to have been obtained "won't happen tonight; it might happen tomorrow."
- The FBI has called off its plans for a press conference to update the media on the latest in the investigation, according to the Boston Police. Like the rest of the news this afternoon, the timing of this press conference has been in flux. Originally scheduled for 1 p.m. and then pushed back to 5 p.m., The Boston Globe reported that the briefing had been canceled, and then postponed, due to the bomb scare at the courthouse. But then, according to NBC News's Pete Williams, who really hasn't been wrong all day, said the FBI were aiming for 8 p.m., which they were. Now that it's cancelled all the journalists waiting can call it a day.
- Massachusetts Gov. Deval Patrick told CNN's Wolf Brlitzer in an interview about "misinformation flying around" that "there often is in large investigations" a confusion, but said this was an example of a well orchestrated effort. No one is under arrest and no one is in custody, Patrick said. He requested "patience" from the American people so as not to compromise the investigation. "They're making progress," he said of the investigation, "but it's going to take time." He continued: "Every hour we're closer," without providing further details to multiple pressing questions from Blitzer. "I don't think anyone knows" if there was a group involved, he said. "This isn't about finding a pattern," Patrick said. "It's about letting the facts lead us, not some suppositions." He said that he hasn't seen any evidence in the investigation. Blitzer then held up a pressure cooker, on air — "I know what it is," Patrick said, "I'm a cook!" — and asked for conclusions from Patrick. "I can't answer that," the governor said. "When they are ready with a complete picture, they will tell us what that it is... I wish they had nailed the perpetrator within minutes of this catastrophe, but I understand in my experience that this is going to take time." Patrick said he was "pretty sure they're going to find that needle" in a haystack. Another reason Patrick said he was calling for patience "for a reason": "Sometimes when you get a really promising leak, you don't want to tell everyone."