UN says Iran has executed 21, arrested over 4,000 since war started

April 29 (Reuters) - Iran has executed at least 21 people since the start of the war with the United States and Israel two months ago and has arrested more than 4,000 on national security-related charges, U.N. human rights chief Volker Turk said on Wednesday.Turk said at least nine people have been executed in connection with protests in January, 10 for alleged membership in opposition groups, and two on espionage charges.