Saudi-led Arab coalition's fighter jets conducted Saturday a series of air raids on Houthis' sites in Harad district, Hajjah governorate, northwest of Yemen, Sky news reported. Yemen has witnessed massive violent clashes between the Houthi fighters and the national forces during the last few years causing instability and chaos in the country. The Houthis participated in the Yemeni demonstrations in 2011 that ousted Yemeni President Ali Abdullah Saleh. They took part in the National Dialogue Conference in February 2014, which called for making Yemen a federation of six regions.