Washington, June 7 -- The Pentagon has elevated concerns regarding Israeli espionage activities, warning that senior American officials could become targets of intensified surveillance amid widening strategic rifts between US President Donald Trump and Israeli Prime Minister Benjamin Netanyahu over the conflict with Iran.

According to a report by NBC News, two current US officials and one former official revealed that the Pentagon's Defence Intelligence Agency (DIA) has recently raised Israel's counter-intelligence threat designation to 'critical', its highest internal assessment level.

A current official told the American broadcaster that the United States already implements stringent safety measures during official visits to Israel, p...