``There were 29 journalists who have been detained not arrested... my authorities inform me that they have all been released,'' Nebojsa Vujovic, charge d'affaires at the Yugoslav embassy here told ABC television.

Up to 30 foreign journalists were reported detained by police in Belgrade late Wednesday and Thursday.

They included a journalist for the French newspaper Liberation, four CNN journalists and members of other news organisations.

On its Internet site, CNN said it and two other networks were banned earlier on Wednesday by Serbian television officials from using their facilities to transmit reports.

Earlier this week the authorities shut down Belgrade radio station B92, the capital's most popular and most independent broadcaster.