The Hague - The International Criminal Court said on Saturday it would probe how the names of at least four confidential witnesses in the trial of former president Laurent Gbagbo were accidentally
Friday's incident in which a closed session of Gbagbo's crimes against humanity trial was mistakenly broadcast on the court's public channel "will be investigated", said the ICC's head of public information Sonia Robla.
A clip of the hearing widely circulated on social media including on the YouTube video channel, shows ICC judge Cuno Tarfusser calling for the trial to go into a closed session at the request of lead prosecutor Eric MacDonald.
But the microphones are left open and MacDonald can be heard saying that he wanted to raise the issue of witness protection.
Due to security concerns about the identity of witnesses the ICC has been monitoring social networks such as Facebook and Twitter, he says.
"Certain bloggers, journalists and members of the public" following the case in the public gallery or on the Internet are "posting live commentary" about the case on Twitter, MacDonald tells the three judges.
These bloggers "are trying to find out the identities of witnesses 9, 10 and 11," MacDonald said according to the French translation of his comments in one YouTube clip.
But he then goes on to pronounce the names to the judges, which could clearly be overheard on the public channel.
A fourth name was also revealed later, media reports said.
Friday's incident is not the first in the trial of Gbagbo and his former firebrand youth militia leader Charles Ble Goude.
On Wednesday, the prosecution's first witness, P547, accidentally gave his name as he told how forces loyal to Gbagbo allegedly fired on unarmed protesters.
Judge Tarfusser immediately halted proceedings and ordered journalists not to use the witness's name. Reporters also had to give their names to ICC security officials.
Gbagbo and Ble Goude have denied four charges of crimes against humanity after 3 000 people were killed following a disputed Ivory Coast presidential vote in late 2010.
Their highly-anticipated trial opened on January 28 and is set to last three to four years.
Gbagbo declared himself the winner of the November 2010 elections, but major powers including France, the former colonial power, the United States and the United Nations backed Alassane Ouattara, who snatched a narrow victory.
The row triggered a bitter standoff that led to clashes on the streets of Abidjan.
Witness protection is a cornerstone of how the ICC operates as it seeks to bring to justice those responsible for the world's worst crimes.