UNITED NATIONS, May 10 (Xinhua) -- The United Nations on Friday voiced concern over consecutive attacks in southern Libya by the Islamic State (IS) terrorist group.

"We are extremely concerned about another attack in Libya claimed by Da'esh yesterday in Ghadwa, south of Sabha, in which several civilians lost their lives," said Farhan Haq, deputy spokesman for UN Secretary-General Antonio Guterres, using another name of the IS.

He noted that Thursday's attack was the second claimed by the IS in one week.

"This is another reason why we need to have a cease-fire and to resume a political process that will reunite the Libyans and enable them to join forces in the fight against terrorism," Haq told a regular press briefing.

IS militants on Thursday launched an attack on the southern town of Ghadwa, 60km south of Sabha city, killing two and injuring several others.

A separate attack several days earlier on an army training center in Sabha killed nine soldiers.

Sabha, southern Libya's largest city, is currently under the control of the east-based army led by Khalifa Haftar. Haftar's forces are in a military campaign to take over the capital city of Tripoli from the UN-recognized government.