The Houthi militants on Tuesday attacked with rockets the Aden refinery and fuel storage tanks caught fire, local sources said.
The attack was the latest against the refinery in recent weeks. In previous attacks, pipes which carry crude from the fuel port into the refinery and fuel tanks were damaged.
The refinery was shut down due to escalating violence in Aden around two months ago. All oil and gas projects shut down when the Saudi-led military operation against the Houthis began in late March.
Today's attack happened after the pro-government forces retook control of Aden international airport and some districts after fierce battles with the Houthis.
The Saudi-led coalition which has been bombing the Houthi camps and weapons provided direct support to the pro-government forces during the battles.
Meanwhile, sources within the popular resistance which has been backing the pro-government forces revealed plans to clear Aden from all militants in days coinciding with reports the government is expected to come back into the country in the near future.
The government, which was ousted by the Houthis early this year, has been staying in and acting from Saudi Arabia for months.
Separately, agencies reported today that tens of aid convoys entered into Aden which has been suffering for months from lacks of supplies and other crises including spread of diseases.
The aid included tens of tons of medicines and foodstuffs, according to the reports.
The situation in Aden has largely deteriorated because of the months-long confrontations between the pro-government forces and the Houthi militants.
A blockade on the city by the Houthis as well as a blockade on all Yemeni sea, land and air routes boosted the suffering of its population.
The blockade on the ports was part of the Arab military intervention against the Houthis.