Had counterterrorism officials been monitoring Dzhokhar Tsarnaev in the days leading up to the Boston marathon bombing, they wouldn't have found much to raise suspicions—other than Dzhokhar's relationship to Tamerlan Tsarnaev. Authorities have found no evidence that Dzhokhar frequented jihadist websites, bought suspicious items, posted radical rhetoric, or did anything else concerning, sources tell the Wall Street Journal. As the Journal puts it, "Any radicalization of Dzhokhar ... would have happened at the last minute, if at all."
That seems to support the narrative that emerged early on: That Dzhokhar was just following Tamerlan's lead. For instance, a former FBI profiler tells the paper that officials' assertion that Tamerlan, not Dzhokhar, was the only one armed and firing at police during their shootout further indicates that Tamerlan was the "ringleader." Officials tell the paper Dzhokhar may more closely match the psychological profile of a run-of-the-mill criminal than a terrorist. That could have an impact on his eventual sentencing, and also underlines a challenge for US counterterrorism officials: "We will have to pick up on indicators more quickly," says one.