The Lebanese army cordoned off the area and restored order, said state-run Tele Liban, without giving details or reporting any casualties.
Arab satellite television al-Arabiya said the incident came as Hezbollah supporters were celebrating Nasrallah’s speech.
Rival supporters insulted the Hezbollah backers, who reacted by firing off a stun grenade at the Sunni mosque of Abdel Nasser, to al-Arabiya reported.
Israeli army radio said on Monday that Israel is prepared to free five Lebanese prisoners and return the bodies of 10 Hezbollah fighters in exchange for the release of two of its soldiers captured in 2006.
The report came after Lebanese sources said progress had been made in UN-sponsored talks on a prisoner exchange between Israel and Hezbollah in Lebanon.
Samir Kantar, the longest-serving Arab prisoner in Israel, is among those who could be exchanged, the army radio said.
In exchange, Israel is demanding the return of two soldiers, Ehud Goldwasser and Eldad Regev, who were captured by Hezbollah in a cross-border raid on July 12, 2006 that sparked a devastating 34-day war.
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