who are the houthi rebels
They started a rebellion in 2004 which led to a Houthi insurgency in Yemen against Yemen's former President, Ali Abdullah Saleh. The group has been led by Abdul-Malik al-Houthi since Hussein Badreddin al-Houthi was reportedly killed by Yemeni army forces in 2004. The Houthis participated in the 2011 Yemeni Revolution, as well as the ensuing National Dialogue Conference (NDC).