Britain has threatened to seek new international sanctions against Sudan, Sudanese rebels and people seen as blocking peace in the war-torn Darfur region.
Foreign Secretary Jack Straw issued the warning Tuesday at the Darfur peace talks in Abuja, Nigeria. Those talks are in their seventh round.
Straw accused both rebel and government forces of breaking the cease-fire in Darfur, and he said world leaders have doubts either side is serious about reaching a peace deal.
The foreign secretary said Britain may add names to a list of people from both sides being considered by the U.N. Security Council's Sanctions Committee.
Three years of fighting in Darfur has displaced some two million people and left tens of thousands of others dead.
Some information for this report was provided by Reuters.