Georgia has launched a criminal investigation into the former President, Mikheil Saakashvili, who is accused of a coup plot, BBC News reports.

In a leaked phone call between Saakashvili and the head of an opposition TV channel he suggests using a "revolutionary scenario" and makes plans to provoke violent confrontation.

The former leader is already facing several criminal charges in Georgia.

The channel, Rustavi 2, is in a legal dispute over its ownership.

Critics of the government say the dispute is a politically motivated attempt to shut the influential TV station down, BBC says.

The authorities deny that there is any political interference in the legal dispute. Rustavi 2 is the country's most-watched broadcaster, our correspondent says.

The channel's boss and Saakashvili have both confirmed the authenticity of the leaked phone call, and accuse the Georgian government of illegal wiretapping.

In the recording Saakashvili discussed erecting barricades to ensure a confrontation in which "faces are smashed". That clash would take place outside the TV station, to prevent its takeover.

Supporters of the ex-president - who is now a regional governor in Ukraine - say the charges against him and other former government officials are politically motivated.