There was no immediate word on casualties.
"Clashes are taking place between the army and former rebels from Misrata on one side and supporters of the old regime on the other," he said.
The coastal city of Misrata saw some of the bloodiest combat of the eight-month uprising that toppled Kadhafi, who was captured and killed by rebels in October 2011.
At least 88 people have been killed and 130 wounded over the past two weeks in fighting between rival tribes in Sebha.
The fighting initially pitted the Arab Awled Sleiman tribe against members of the Toubou, a non-Arab ethnic group that has long complained of being marginalised by Tripoli. The Awled Sleiman have also clashed with other Arab tribes.
Kadhafi loyalists have taken advantage of the chaos to launch repeated attacks on the city's Tamenhant air base, according to local officials.
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"Clashes are taking place between the army and former rebels from Misrata on one side and supporters of the old regime on the other," he said.
The coastal city of Misrata saw some of the bloodiest combat of the eight-month uprising that toppled Kadhafi, who was captured and killed by rebels in October 2011.
At least 88 people have been killed and 130 wounded over the past two weeks in fighting between rival tribes in Sebha.
The fighting initially pitted the Arab Awled Sleiman tribe against members of the Toubou, a non-Arab ethnic group that has long complained of being marginalised by Tripoli. The Awled Sleiman have also clashed with other Arab tribes.
Kadhafi loyalists have taken advantage of the chaos to launch repeated attacks on the city's Tamenhant air base, according to local officials.
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