5/16: Texas tornadoes leave path of destruction; Are Afghan troops ready to take over?

      |Twisters with winds of up to 200 miles per hour in north Texas left six dead, many injured and scores of homes destroyed in their wake; Then, the surviving Boston bombings suspect wrote a note inside the boat in which he was hiding, detailing the motive for the attack; Also, American combat troops are due to leave Afghanistan after next year and are training Afghans to take over security

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