CCTV9英语新闻：Thousands demand a recall referendum for Pres Maduro

A demonstrator is blocked by Bolivarian National police during an anti-government march to the headquarters of the national electoral body, CNE, in Caracas, Venezuela, Wednesday, May 18, 2016. Opposition protesters were blocked from reaching the CNE as they demand the government allow it to pursue a recall referendum against Venezuela's President Nicolas Maduro.