A prominent anti-corruption activist was one of four people killed in an explosion in Libya’s second city of Benghazi, in the east of the strife-torn country, officials said on Sunday. “An explosion caused by a mortar shell occurred in the Al Kish neighbourhood” of Benghazi, said Mohamad Al Azumi, a spokesman for forces allied with controversial Field Marshal Khalifa Haftar. He said the shell hit a group of cars, sparking the blast. A medical official said the explosion on Saturday night killed four people and wounded 23 others, all of them civilians including “the well-known anti-corruption activist Mohamad Bugaighis.” Another source in the forces loyal to Haftar said the shell stuck near the headquarters of a brigade located in an area also known for its cafes and shops. The origin of the mortar round was unknown, said the source. Bugaighis was known for his support of the idea that Haftar be made commander of the Libyan national army, as well as his opposition to militants. For two and a half years, Benghazi has seen bloody battles between loyalist forces led by Haftar and armed groups including militants from the Daesh group and Ansar Al Sharia, which is close to Al Qaeda.