Authorities say an arrest has been made in connection with the suspicious packages sent out to prominent US Democrats and their supporters.
This comes after two other packages were discovered today - one was addressed to New Jersey Democratic senator Cory Booker, the other to former President Obama's director of national intelligence James Clapper.
That brings the total number of suspicious packages to 12.
Officials say crudely made pipe bombs were inside, but none of the bombs have detonated.