Yemen's Houthi armed group attacked a Saudi oil refinery yesterday with a ballistic missile, reported Al-Masdar.
The ballistic 'Burkan-2' missile hit a refinery inside the border of Saudi Arabia, in the western coast of Yanbu province. The missile travelled 1,100 kilometres without being intercepted by Saudi Arabia's air force defence systems.
A large explosion and fire occurred upon impact, forcing Saudi firefighters to work throughout the night to extinguish the explosion.
Houthis regularly conduct military incursions and execute missiles across Saudi Arabia's southern border.
Since 25 March 2015 a Saudi-led coalition has been launching a military campaign against the Houthi group in Yemen to prevent the spread of their control over the country.
Since the start of the war some 8,167 people have been killed and over 45,000 wounded. Over 20 million Yemenis – around one third of the population – are in need of humanitarian aid.