Media rights group Reporters without Borders (RSF) has urged Uzbekistan's leader to allow media to operate freely.
The call came after journalists were told to leave a town where security forces bloodily suppressed an uprising.
Reporters working for foreign news organisations left the Uzbek town of Andizhan on Saturday after security services in the Central Asian republic briefly detained them and warned them they were in danger.
"When the authorities keep journalists away from a conflict zone it is most often to hide abuses committed there. We are very concerned and urge President Islam Karimov to allow our colleagues to cover these events," RSF said in a statement.
Andizhan was the scene of a rebellion on Friday, sparked by the trial of 23 Muslim businessmen and blamed by Mr Karimov on Islamic extremists.
Human rights activists say up to 500 people may have been killed in the uprising, the bloodiest chapter in the country's post-Soviet history.
Seven journalists had been in Andizhan covering the violence until Saturday. Most, including Reuters correspondent Shamil Baigin, worked for foreign media. One worked for a pro-opposition website.
Although parts of the town remain sealed off, some reporters have since been able to return.
Uzbek media is tightly controlled by the state and has not reported from inside the town.
Paris-based RSF said U.S., Russian and British cable television channels were cut throughout Uzbekistan on Friday and news was replaced with cultural programmes and music clips.
"It is urgent to put a definitive end to all censorship so that the Uzbek people can be guaranteed impartial coverage of the events under way," RSF said.