Fighting in the Libyan coastal city of Sirte left at least 12 rebels dead and 59 injured, DPA reported.
The report also added that two fighters loyal to fugitive leader Moamer Gaddafi were detained and claimed that one of Gaddafi's sons, al-Moatassim, was inside the city.
Rebel forces entered the city, which is Gaddafi's hometown, on Thursday from the south and west. It is one of the few remaining towns in Libya still controlled by Gaddafi loyalists.
Gaddafi has not been seen in public since the rebels captured Tripoli late August, although his spokesman repeatedly claims that he is still in Libya.
Another son of Gaddafi, al-Saadi, has crossed into Niger last week. Two other sons, Mohamed and Hannibal, and their sister Aisha have been in Algeria since August.
Meanwhile, Turkish Prime Minister Recep Tayyip Erdogan is scheduled to arrive in Libya on Friday as part of his "Arab Spring" tour.