One resident leaving the city said Islamic State militants had told them more fighting was likely in the next few days. Fuel was running short in Sirte while some shops had closed, he said.
The region east of Sirte, towards Benghazi, has been a battlefield since December when Libya Dawn tried to seize Libya’s biggest oil ports, Es Sider and Ras Lanuf, which are held by forces loyal to the internationally recognised government of Prime Minister Abdullah al-Thinni in the east.
Reinforcements from Misrata could be seen arriving on Monday on the outskirts of Sirte – the birthplace of Muammar Gaddafi, who was ousted four years ago after decades in power.
Islamic State militants have exploited turmoil in Libya, a major oil producer, where Thinni’s government and the administration in Tripoli and their respective allies are fighting for power.
Militants loyal to Islamic State have taken over government buildings, a hospital and the university in Sirte and at the weekend fought near the city with Libya Dawn forces, although there was no major confrontation in the city centre, residents said.
Tripoli hotel attack
On Sunday, a car bomb exploded in Misrata at the headquarters of a force sent to fight Islamic State militants in Sirte. Misrata has largely been spared the kind of violence gripping other parts of Libya. There was no claim of responsibility.
Militants loyal to Islamic State claimed responsibility for an attack on the luxury Corinthia hotel in Tripoli in January, as well as the killing of a group of Egyptian Copts from Sirte that triggered air strikes by Egypt.