Yemen's Aden refinery resumed operations on Tuesday after being shut for over five months, an industry source at the refinery told Reuters.
"The refinery is back online and is refining crude it had in storage from before," the source said, adding the refinery was now operating at half of its processing capacity.
The 150,000 barrel-per-day plant located in the southern city of Aden, stopped operations in April when Aden Refinery Company declared force majeure due to the worsening political and security situation in the country.
The refinery was set ablaze in a rocket attack by the Houthis in July, a refinery official told AFP on condition of anonymity.
The refinery currently houses 1.2mn tonnes of crude oil and also has several gas tanks. The latest attack came as government forces attempted to push back rebel militia.
Yemen's embattled president Abd-Rabbu Mansour Hadi, who escaped to Saudi Arabia six months ago, returned to Aden last Tuesday, according to media reports.
A Saudi-led coalition continues to fight Houthi rebels in the country.