The BBC's Nick Springate said the clashes followed the release of a tape reportedly from Col Gaddafi
A gun battle in the Libyan capital Tripoli between forces loyal to the transitional government and gunmen they say support fugitive ex-leader Col Muammar Gaddafi has now ended.
The fighting started after a demonstration by Gaddafi loyalists.
A hospital doctor has told the BBC that nine people were seriously injured.
Although the gun battle has finished, the BBC understands that NTC forces are carrying out an operation to root out Gaddafi loyalists from the Abu Salim district at the centre of the disturbance.
Security vacuum
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For two hours, we heard a very heavy exchange of gunfire. Word got out that clashes were going on between pro-Gaddafi residents in the area and NTC forces who had moved in.
The problem at this stage in Tripoli is that everyone is armed. When it comes to Abu Salim district itself, a lot of people there are armed there.
A lot of them are suspected to be posing as people who were opposed to Col Gaddafi's regime. They had set up local councils as well and they simply changed the banner when the rebels arrived in August.
That was always a concern for locals in Abu Salim who looked at it as a pro-Gaddafi neighbourhood that really needed to be cleaned out.
At the scene
The problem at this stage in Tripoli is that everyone is armed. When it comes to Abu Salim district itself, a lot of people there are armed there.
A lot of them are suspected to be posing as people who were opposed to Col Gaddafi's regime. They had set up local councils as well and they simply changed the banner when the rebels arrived in August.
That was always a concern for locals in Abu Salim who looked at it as a pro-Gaddafi neighbourhood that really needed to be cleaned out.
The BBC's Caroline Hawley, in Tripoli, says there are reports that the green flag of the Gaddafi government was raised in other towns as well.
NTC forces cordoned off the area, fired warning shots and stopped cars to search them. However, the witness did not see anyone being detained.
Our correspondent says this is likely to rattle the transitional authorities of the NTC, who are trying to exert control in the midst of a political and security vacuum.
Friday's fighting took place near a notorious prison where political prisoners were held under the previous government.
The area is a stronghold of support for Col Gaddafi.
An eyewitness told the BBC he saw about 20 pro-Gaddafi fighters come out firing AK-47s.
Forces loyal to the NTC engaged them from pick-up trucks fitted with heavy machine guns, the eyewitness said.
A fighter with Tripoli's Eagle Brigade, Assem al-Bashir, told the Associated Press the shooting began after a man was spotted raising the green flag that symbolises Col Gaddafi's ousted government.
There are unconfirmed reports that between 20 and 100 pro-Gaddafi fighters were involved.
A BBC journalist in Tripoli saw over 200 NTC fighters from eight different brigades in the streets.
A doctor at the Tripoli Medical Centre told the BBC nine people were seriously injured in Friday's clashes.
There are also reports that Gaddafi loyalists have appeared on Libya's western border with Tunisia, where they have apparently attacked cars.
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BBC
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