An Israeli attack on Iranian territory could radically change dynamics and result in there being nothing left of the "Zionist regime", Iran's President Ebrahim Raisi was quoted as saying on Tuesday by the official IRNA news agency. Raisi began a three day visit to Pakistan on Monday and has vowed to boost trade between the neighbouring nations to $10 billion a year. On Friday, explosions were heard over the Iranian city of Isfahan in what sources said was an Israeli attack but Tehran played down the incident and said it had no plans for retaliation.