June 20 (UPI) -- United Nations Secretary-General Antonio Guterres on Friday urged de-escalation of the conflict between Israel and Iran because "we are on course to chaos." The United Nations Security Council met in New York City to discuss the conflict that began one week ago. Iran called for a special session of the 15-member Security Council. Iranian Ambassador Amir Saeid Iravani described the "large-scale, unprovoked military attack" by Israel. Guterres spoke to the UN. delegations from