A Colombian rebel group says it has suspended plans to release a Briton and four Israelis being held hostage.
The ELN group said army operations in the Sierra Nevada mountains had put the hostages in danger.
A Spaniard and German were released two weeks ago and observers hoped the rest would be released before Christmas.
The backpackers were taken hostage in September. Colombia has the world's highest kidnap rate, with more than 3,000 people abducted each year.