The chairman of the House Homeland Security Committee said Sunday he thinks the Boston Marathon bombing suspects were trained in carrying out the attack. Chairman Rep. Michael McCaul told “Fox News Sunday” he thinks suspects Dzhokhar and Tamerlan Tsarnaev had help, considering the device’s level of sophistication and the type of device -- a shrapnel-packed, pressure-cooker bomb. “That leads me to believe there was a trainer,” the Texas Republican said. Homemade bombs built from pressure cookers have been a frequent weapon of militants in Afghanistan, India and Pakistan. Al Qaeda's branch in Yemen once published an online manual on how...