The US government has blocked a British court hearing on the island of Diego Garcia, a remote British territory that houses a US military base.
The hearing involved a group of migrants who are challenging their detention on the island, claiming it is illegal.
The US raised security concerns and refused to allow lawyers and journalists to visit the island, citing a planned site visit as a potential threat.
As a result, the court has been forced to postpone the hearing and will determine next steps in the UK.
