Who are Rohangyans? What is the conflict? Why they are suffering?

Acording to United Nations Rohangyans Muslims are the most helpless peoples in the world.
In Myanmar there is 88% population is Buddhist, 6 % Christians and Muslims are only 4% minority. In last few days 2 to 3 thousands Muslims are been killed by Buddhist terrorists and Burmese army. In recent crices what happened with Rohangyans why army  started brutality. Acording to a local report one violent group of Rohangya attacked on Burmese army and Burmese army reapond with brutality and killed more than 100 Rohangya Muslims in that operation thousands of Rohangya Muslims gathered near the Bangladesh border.
Muslims in the Burma facing Gang rapes, executions, Orson and child murder. Buddhist terrorists are killing the Muslims like a butcher they fired the house and shops.
In Myanmar during recent census Rohangya Muslims were forced to register there self as a Bangladeshi. And most of the Muslims papulation are officials not went.
In Myanmar Muslims are the only minority that that cannot b registered thay dont have identity they don't have land, they don't have house for shelter they are living in tents, they are facing the lack of food, they cannot marry easily they have to register their marriage that is another trouble for them. This conflict between Buddhist and Muslims is not new is older than 1.5 century. Acording to Myanmar Buddhists Muslims are not belong to Myanmar they came from out side some of people's thoughts they are the Descendants of Arab merchants and other's thoughts that Rohangyans are a group how convert in Inslam after the teachings of Arabs. Every time when Buddhists start cruelty Rohangyans start to go out from Myanmar for their life but most of the countries closed the borders recently Bangladesh refused to give shelter also.
In these conditions Muslim Ummah need to Unite and help the Rohangyans Muslims who are helpless, houseless and countryless. Muslims countries need to give shelter to Rohangya Muslims.