The blasts took place on Friday evening, said Hamid Albandag, the coastal city’s representative in the country’s internationally-recognized government.
Following the deadly attacks, clashes erupted between militants belonging to ISIL terror group’s local affiliate and al-Qaeda-linked militants. The fighting continued into the Saturday afternoon.
The explosions come as the Libyan military has surrounded Derna from all directions for months.
In June, the al-Qaeda-linked militants drove ISIL terrorists from the city’s central part, which was under their control since late last year.
Libya, an oil-rich country in North Africa, plunged into chaos after an uprising in 2011 led to the ouster and subsequent death of its long-time dictator, Muammar Gaddafi.