TRIPOLI, June 6 (Xinhua) -- Two Libyan security officers were killed and four others wounded in a suicide bombing attack against a security checkpoint in the southern Libyan city of Sabha on Sunday.

A man walks past a destoryed vehicle in the eastern Libyan city of Benghazi, Libya, on May 25, 2018. A car bomb explosion killed six and injured more than 20 people in the eastern Libyan city of Benghazi late Thursday, a local official said. (File photo: Xinhua)

The attack took place at around 6:30 p.m. local time (1630 GMT), when a suicide bomber driving a tuk-tuk vehicle loaded with highly explosives attacked the checkpoint, Sunusi Saleh Sunusi, the security chief of Sabha, was quoted as saying by a statement released by the Sabha city government on its Facebook page.

The city government demanded all security agencies "stop such terrorist attacks and reveal those responsible for them."

No group has yet claimed responsibility for the attack.