At the party convention, Gary Johnson got his preferred running mate, former Massachusetts Gov. Bill Weld, in a weekend gathering that drew sharp contrasts with the major party candidates.
Search crews are ending their search. No one was found.
The boy, 4, was released unhurt from a Cincinnati hospital Saturday and the zoo opened on Sunday. Gorilla World, home to nine western lowland gorillas, was closed.
Police say no suspects are in custody.