Unidentified militants detonated a building belonging to late strongman Muammar Gaddafi-era intelligence service in Libya’s eastern Benghazi city on Monday.
No casualties were reported in the blast in Benghazi’s Fuwayhat district, according to eyewitnesses.
There has been no claim of responsibility for the blast.
Libya has been dogged by political instability since Gaddafi’s 2011 ouster and death, with several militias holding onto their weapons following the bloody uprising.
Benghazi, Libya’s second city, has recently turned into a battlefield between troops loyal to renegade general Khalifa Haftar and the Islamist Ansar al-Sharia militia, while the Libyan government has remained largely absent from the scene.