DUBAI - Iranian authorities have arrested hundreds of people and executed half a dozen in a sweeping security crackdown that analysts say is aimed at exerting control after a brief but punishing war with Israel exposed Iran’s deep infiltration by Israeli intelligence.

Iran said that more than 900 people were killed in its nearly two-week war with Israel, which subsided with a ceasefire shortly after the U.S. carried out strikes on three of Iran’s underground nuclear facilities.

German federal prosecutors said on Tuesday that they suspect a Danish national was spying for Iranian intelligence to gather information about Jewish targets in Berlin, including individuals, possibly in preparation for terror attacks.

Germany has foiled an Iranian plot to attack Israelis and Jewish community leaders. Jens Rommel, the federal prosecutor, said police had arrested “Ali S”, a Danish citizen of Afghan origin, on suspicion of carrying out surveillance of potential targets.

German authorities arrested a Danish national suspected of surveilling Jewish targets on Iran’s behalf for possible terrorist attacks, the country’s