WikiLeaks says that Ecuador has shut down internet access for its founder Julian Assange.
The transparency activist has sought asylum at London's Ecuadorean embassy since 2012 to avoid extradition over sex assault allegations.
WikiLeaks accused US Secretary of State John Kerry of asking Ecuador to stop it publishing documents about Hillary Clinton.
The US state department said the allegation was "simply untrue".
Ecuador's Foreign Minister Guillaume Long made no comment on the allegations, saying only: "The circumstances that led to the granting of asylum remain."
WikiLeaks has recently been releasing emails from Hillary Clinton's campaign.