Five captured Daesh militants told that at least three local senior Daesh figures managed to flee the city, Libya Observer reported.
On Saturday, the Ghardabiya airbase, just 12 miles south of Sirte, was retaken by the Libyan militia.
Years of instability created a political and security vacuum in the country that was filled by Islamist militants. Daesh forces gained a foothold on the Libyan coast by capturing the cities of Sirte and Derna.
The Daesh is a militant jihadist group outlawed in many countries, including Russia.