Homeland Security Secretary Jeh Johnson said Sunday the threat of terrorist-inspired "lone wolf" attacks is "the thing that keeps me up at night" 15 years after the September 11, 2001, terrorist attacks. "We're better now at detecting the 9/11-style attacks, but it's more challenging with this new environment that we're in." Johnson said he could see the towers collapse from his Manhattan office window on 9/11, when he was an attorney in private practice. Our government has become pretty good at detecting overseas plots against the homeland. Our intelligence community, our law enforcement community, are pretty good at connecting those types of dots," Johnson said.

Source: CNN September 11, 2016 13:07 UTC