WASHINGTON/DUBAI/JERUSALEM (Reuters) -Iran and Israel traded further air attacks on Thursday as President Donald Trump kept the world guessing about whether the United States would join Israel's bombardment of Iranian nuclear facilities. A week of Israeli air and missile strikes against its major rival has wiped out the top echelon of Iran's military command, damaged its nuclear capabilities and killed hundreds of people, while Iranian retaliatory strikes have killed two dozen civilians in Israel. Speaking to reporters outside the White House on Wednesday, Trump declined to say if he had made any decision on whether to join Israel's air campaign.