Early Friday the FBI confirmed that an 11th package addressed to New Jersey Sen. Cory Booker (D)'s Camden office was intercepted in Florida. It was similar in size and appearance to the previous mailings. 

A 12th package, meanwhile, was addressed to both CNN and former Director of National Intelligence - turned activist CNN commentator, James Clapper. Police evacuated down the Manhattan post office in response.

Clapper called the packages "domestic terrorism." 

"My wife and I are away from home right now. And our neighbors have been retrieving our mail. Been very concerned about them. So in one sense, it's kind of a relief, but it's not a surprise," he said. "This is definitely domestic terrorism. No question about it in my mind."