Al Jazeera's Zeina Khodr reports heavy fighting and shelling in parts of Tripoli.

Khodr reports:

"What we're hearing is heavy shelling in the Bab Al-Aziziyah area, and we're seeing dozens of fighters moving in that direction. There are pockets of resistence in Tripoli, and Bab Al-Aziziyah is one of them.

"The people of Tripoli really are maintaining law and order in the areas that they are now controlling. They have set up checkpoints, are searching cars and looking for possible Gaddafi supporters. Because, ever since late last night they have been worried about sleeper cells in the capital.

"There are also international journalists trapped inside the Rixos hotel, which is in the area known as al-Nasr Khor. They are not able to leave the hotel because there are Gaddafi men in the building and around the area. They have been trapped there even before the rebels advanced into the city."