Haiti has pushed back next week's presidential runoff vote, election officials said Monday, without immediately announcing a new date.

The runoff had been scheduled for December 27, after an October 25 first-round vote marred by allegations of massive voter fraud.

The runoff was to pit Jovenel Moise -- backed by the outgoing president and the ruling party -- against Jude Celestin, the second-place vote-getter from more than 50 contenders in the first-round of balloting.