The Emirates state news agency WAM reports the brother of Emirates' president died in a helicopter crash off the Gulf coast. The crash killed several of Sheik Nasser Bin Zayed Al Nahyan's colleagues and took place Monday night, added the agency. Sheik Nasser was the brother of Sheik Khalifa bin Zayed Al Nayhan, the president of a federation of seven semi-autonomous states that make the United Arab Emirates. The Emirates Ministry of Presidential Affairs announced a three-day mourning period starting on Tuesday. Sheik Nasser did not hold an official position.