On 31 May 2010, relations between Israel and the Palestinians were further strained when Israel carried out the Gaza flotilla raid. Palestinian President Mahmoud Abbas stated that "Israel has committed a massacre", and declared a three-day mourning period. Palestinian official Mustafa Barghouti said that the attack would lead to the international boycott growing in strength, and called Israel "the most despicable state in the world". Prime Minister Salam Fayyad also criticized the attack.