Brazil's President Luiz Inacio Lula da Silva and his main challenger Flavio Bolsonaro wrapped up their campaigns on Saturday in the powerhouse state of Sao Paulo, where a fifth of the nation's vote is based, seeking to rally supporters and convince the undecided on the eve of Sunday's nail-biter election.

The head of Tennessee's prison system has resigned in the first major shake-up since the stunning failed execution of convicted murderer Christa Pike, who is in critical condition after surviving two lethal injections. Tennessee Governor Bill Lee, who previously denied Pike clemency, has halted further executions through the rest of the year while a review is conducted.