TRIPOLI: The UN Support Mission in Libya said Tuesday that it was “gravely alarmed” over new military mobilizations by rival groups in the Libyan capital.

In recent days, armed vehicles have reportedly moved into Tripoli from Misrata, around 200 kilometers (125 miles) away, and on Monday night gunfire was heard in the capital, according to witnesses and videos circulated online.

UNSMIL said the recent “rapidly escalating tensions and military mobilization” in Tripoli “could lead to armed confrontation.”

Sabiha Mohamad, a resident in western Tripoli, told AFP she had heard the gunshots but said “there was more fear than harm.”

There were no official reports of casualties, and it remained unclear who fired the shots.