Four people were killed and 33 wounded on Thursday in car bombings in the eastern Libyan city of Benghazi.
Two bomb-laden vehicles exploded near a group of Libyan National Army leaders.
Spokesman for the Benghazi-based government's Interior Ministry, Tarek El-Kharraz said several senior LNA figures had gathered in western Benghazi to attend the funeral service of Khalifa Mismari, a high-ranking military general.
El-Kharraz said the dead in the attack included two civilians and two soldiers, and the wounded included civilians, army personnel and police. He said none of the military leaders was killed or wounded.
LNA commander Khalifa Haftar ordered an investigation into the attack.
According to El-Kharraz, the east-based government recently arrested a group of collaborators inside Benghazi who were in touch with Tripoli-based militias.
During interrogation, they confessed that there were other cells of collaborators inside the LNA stronghold.
The LNA had launched on April 4 an offensive against Tripoli to cleanse it of criminal and terrorist gangs that are loyal to the Government of National Accord.