Two people have been stabbed to death in Ecuador after a man attacked people waiting for President Rafael Correa to address an election rally.
A video broadcast on local TV showed a man wielding a big knife as he pushed though a crowd of Correa supporters.
Four people were also injured in the attack in the town of Quininde, and a man has been arrested, officials said.
Opinion polls suggest Mr Correa, who has been in office since 2007, will be comfortably re-elected on 17 February.
President Correa, who was on his way to the rally in Quininde in north-western Esmeraldas province, cancelled his appearance.
"Best wishes to the families of the victims . The video of the attack is spine-chilling," President Correa wrote on Twitter.
He was referring to footage that purported to show a man stabbing at a crowd as several people carrying banners tried to hit him.
Interior Minister Jose Serrano said a suspect had been detained and it was hoped that this was "an isolated case".
President Correa, 49, is running for an unprecedented third term.
He faces a divided and weakened opposition and is expected to win.