International aid groups say Yemen's conflict has killed up to 2,000 people and wounded 8,000, while recent U.N. estimates have said that at least 1,037 civilians, including 130 women and 234 children, have been killed in the fighting. London-based Amnesty International said in its report Thursday that residents in the rebel-held capital, Sanaa, are "caught in a deadly crossfire between the Saudi Arabian-led coalition airstrikes and anti-aircraft fire from the Houthi armed group."