The army of Libya's internationally recognized government announced on Jan. 18 that it would cease fire, two days after an Islamist-backed militia alliance announced a truce.
"We declare a ceasefire from midnight (2200 GMT) Sunday," said the army said, stressing however that it would continue to pursue "terrorists", as UN-brokered peace talks resume in Geneva next week.
The United States Tuesday condemned a strike by Libyan aircraft that bombed an oil tanker off the Islamist-held port of Derna, killing two crew members.
The crewmen -- a Greek and a Romanian -- were killed on the Liberian-registered vessel, the Araevo.
Two other crewmen, both Filipinos, were wounded in the attack.