Authorities in Ecuador say a man wielding a large knife killed two people and wounded four in a crowd that was awaiting President Rafael Correa for a political rally.

Video of the Monday night attack broadcast by local media shows a tall, stocky man attacking people apparently indiscriminately in the crowd's first few rows next to the stage.

Officials arrested the man and have not yet identified him or disclosed a possible motive.

Correa canceled his appearance at the rally in the northeastern town of Quininde and called the attacker "deranged" in a tweet. Correa is up for re-election on Feb. 17, and the campaign has been peaceful.