initial tests of the letter turned up negative for cyanide. but a second test came up positive. authorities now retesting to confirm. >> a man is under arrest for threatening to bomb the u.s. embassy in tokyo and kill ambassador caroline kennedy. police say the 52-year-old admitted to making three phone calls between march 5th and the 14th threatening to blow up the embassy and a u.s. military base. he is accused of making multiple death threats against kennedy. she took over in 2013. >> president obama delivering a direct message to the people of iran about a nuclear deal. leland vittert is live in washington with the latest. >> good morning. what exactly the president hopes to accomplish by speaking to the public of a religious state led by the ayatollah is a little bit unclear. we are days away from yet another deadline in nuclear