ISLAMABAD- Islamabad Police today arrested four persons, including two butchers, involved in the sale and purchase of dead animal's meat. According to sources, two persons identified as Nasir and Ashraf were throwing their dead animal into a river bank in Pindorian area of the Federal Capital when two butchers arrived there. The butchers purchased the dead animal from the owners and took it away for selling its meat. Police got the information and arrested all the accused.