"Once again, Persia is trying to wipe out the Jews," said Lipowsky, a research analyst for the Counter Extremism Project, a nonprofit with offices in New York. "We're getting our own live reenactment of the Purim story."

For many Israelis, the blare of the siren and race to shelter has become an all-too-familiar ritual in recent years. The alarms went off throughout Saturday, Sunday and Monday, after the attack on Iran by America and Israel.