Boston police say investigators have discovered four undetonated devices, including one similar to the pressure cooker bombs used at the Boston Marathon. Police also believe the suspects may have been planning additional attacks. The brothers reportedly told the man whom they carjacked Thursday night that they wanted to drive down to New York. The FBI has acknowledged it questioned the older brother, Tamarlan Tsarnaev, at the request of the Russian government in 2011 after Russia flagged him as a “follower of radical Islam.” No wrongdoing was found, and he went on to spend six months in Chechnya and Dagestan in 2012.