Jon Hanssen-Bauer, who is Norway’s special envoy to Sri Lanka, met government officials in Colombo on Wednesday to salvage the talks.
The rebels say they will not attend peace talks in Geneva next week unless restrictions on their movements end.
More than 60 people have died in bombings in Sri Lanka in the past week.
Correspondents say the past week has been one of the bloodiest since the government and the rebels agreed a 2002 truce.
Source: BBC News
