there have been several arrests over alled marginazation and racism.onstration erupted in 2006 after they rejected blood donated by ethiopian jews and 2013 they admitted to forcibly admitting birth control injections to ethiopian women without their consent. saudi arabia has denied sending any forces into yemen to fight houthi rebels. earlier on sunday witnesses in the port city of aiden said that they had seen arab special forces there. mohamed has more from the saudi capitol, riyadh. >> reporter: sources in aiden say these men are not what they appear to be. although their clothing is similar to attire worn in the area, they are said to be arab coalition troops in aiden to help with fighting against the houthi malitia and local fighters don't usually have access to the kind of weapons seen in this exclusive video. >> it's antitank weapon and years by light infantry troops and typical weapon used by special operation forces and at the end of the day you have to define your objective and then find the best way to achieve it. so going with a grand opera