TEHRAN — Iran will respond to any attack against its infrastructure, including by striking Israel, the head of the country's top security body said on Friday, as Tehran and Washington have resumed fighting this week. "Any attack on infrastructure will be retaliated against, and the criminal Zionist regime responsible for these atrocities will not be safe from the response of our fighters," Mohammad Bagher Zolghadr said in a statement carried by state TV. Fighting picked up again this week between the U.S. and Iran in the most significant exchange of fire since the two sides signed a memorandum of understanding on June 17, seeking to formalize an April ceasefire and guide talks to conclusively end the war. The U.S. military carried out heavy strikes overnight between Wednesday and Thursday, saying it targeted 90 military sites. But the Islamic republic accused Washington of also targeting civilian infrastructure in order to detract from the funeral of late supreme leader Ali Khamenei. Bridges and railway links between the capital Tehran and Khamenei's hometown of Mashhad, where he was bu