Two More Suspicious Packages Collected Targeting Cory Booker, James Clapper

The latest package addressed to Booker was found Friday morning at or near Opa-locka in South Florida, sources said.

Investigators racing to identify who mailed 11 suspected bombs to former President Barack Obama, former Vice President Joe Biden, former Secretary of State and presidential candidate Hillary Clinton and other public figures are chasing promising leads pointing them to South Florida as the potential origin for some of the menacing parcels, sources told ABC News on Thursday.

Law enforcement agencies were deploying additional resources to South Florida in an all-out effort to find who mass mailed the suspicious packages containing explosive devices that authorities say are meant to maim and kill, the sources said.

"We are investigating all this with great precision. I can say with certainty that we will identify and arrest the person or people responsible for these acts," New York police Commissioner James O'Neill said at a news conference Thursday afternoon. "Law enforcement professionals do not care about the politics involved in these acts."