By Ahmed Tolba, Enas Alashray and Bo Erickson

DUBAI/WASHINGTON, June 11 (Reuters) - The United States and Iran traded air attacks on Thursday for a second straight day, with President Donald Trump vowing further strikes if Tehran does not immediately agree to a peace deal.

The escalation in hostilities began earlier this week with the downing of a U.S. Apache helicopter near the Strait of Hormuz, which sparked a series of tit-for-tat attacks across Iran and on U.S. bases around the region.