Sectarian violence has led to dozens of deaths and hundreds of injuries since last year . The clashes pit Shiite Houthi rebels against Sunni Sunni militants . The Red Crescent has been unable to access Dammaj to treat wounded civilians . Saada government officials and a spokesman for Salafis in Dammaj accuse Houthi rebels of firing mortars and rockets last week at Dammaj 's Al-Mazraa mosque -- part of a Salafi religious institute -- in a bid to force Salafis to leave the area . Yemen , the most impoverished country in the Middle East , faces growing separatist movement .
Sectarian violence has led to dozens of deaths and hundreds of injuries since last year . The clashes pit Shiite Houthi rebels against Sunni Sunni militants . The Red Crescent has been unable to access Dammaj to treat wounded civilians . Yemen , the most impoverished country in the Middle East , faces growing separatist movement .