Update: Battle for Libya

Anti-aircraft fire has been seen in the sky over the Libyan capital, Tripoli.

Earlier, Pro-Gaddafi forces launched another barrage of rockets and mortars against Misurata.

Libya's government has denied accusations it used cluster bombs in Misurata. On Friday, the advocacy group Human Rights Watch said it had observed cluster munitions explode over the city.

The weapons are banned by more than one hundred countries.

Earlier, a resident of Misurata explained what he saw to Al Jazeera.