NEW YORK (WABC) -- Passover officially began on Monday at sundown.
The Seder dinner is a central part of the eight day Passover festival.
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Passover celebrates freedom and the Israelites' liberation from Egyptian slavery.
Mayor Bill de Blasio and the NYPD say the police will be out in full force for the Jewish holiday.
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They are visiting synagogues as a precaution after the recent ISIS attacks in Egypt.
AP
An Ultra-Orthodox Jewish man examines a special Matza, a traditional handmade Passover unleavened bread, in a bakery in Kfar Chabad near Tel Aviv, Israel on April 11, 2011. (AP Photo/Ariel Schalit)