Guards at the presidential palace in Yemen's second city Aden clashed Tuesday with militiamen providing security for the complex in a dispute over unpaid wages, a military source said.
At least two members of the presidential guard were wounded in the shootout, the source said.
The clash reflects a state of chaos that prevails in Aden, the country's main southern city which pro-government forces backed by Saudi-led coalition air strikes recaptured from Shiite rebels in July.
The presidential guard is led by a son of President Abedrabbo Mansour Hadi, who returned briefly to Aden in September from exile in Riyadh, to where he has since gone back.
Soldiers from the force clashed with fighters from the Popular Resistance, a group of southern factions that fought alongside Hadi loyalists against the Iran-backed Huthi rebels, the military source said.
The fighters were protesting a delay in their wages, the source added.
"The fighting has subsided, but tension remains at the Maashiq palace," the source added.
The palace was severely damaged during the fighting between Hadi loyalists and the rebels, but was recently repaired by the United Arab Emirates, which along with Saudi Arabia is taking a lead role in supporting Hadi.
Hadi declared Aden a temporary capital after he fled house arrest in Sanaa in February, months after the insurgents overran the capital unopposed. He later left for Riyadh as the Huthis approached Aden.