The cargo ship sank off the coast of Misrata due to bad weather conditions.
The capture of Sirte is a major boost for the UN-backed unity government which was formed in Tripoli last year.
Even though Libyan pro-government forces have cornered DAESH in a few pockets of Sirte, analysts say defeat there will be far from the end of the terrorist group in Libya.
DAESH has extended its presence along some 250 km of Libya's Mediterranean coast on both sides of the coastal city of Sirte, and in January attacked the oil ports of Es Sider and Ras Lanuf.
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