The military said the accomplice, Amjad Elewi, assisted in the "planning and execution" of a shooting attack that killed two Israelis who were driving their car in the West Bank. He is serving two life sentences plus 30 years for his role in the attack.
The military said it sealed the crossings in and out of the West Bank and the Gaza Strip as a security precaution for the Jewish holiday of Yom Kippur, Judaism's holiest day.
Jews traditionally spend the day asking for forgiveness at intense prayer services. It caps a 10-day period of soul-searching that began with Rosh Hashana, the Jewish New Year holiday. Shops, cafes and businesses shut down, and TV and radio stations go silent.
Highways and roads are virtually empty except for secular youth enjoying the chance to bike and skateboard freely. Ahead of the holiday, hundreds of Jews gathered in Jerusalem, Tel Aviv and elsewhere in Israel to pray for people in neighboring Syria, the Times of Israel reported.
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The prayers were unusual, as Syria has fought several wars with Israel.
Israel has largely kept to the sidelines of the civil war, but wounded Syrians who have reached the frontier have been treated by Israeli army medics who brought them into the country for care at Israeli hospitals.
Police said forces shuttered a West Bank pastry shop belonging to the family of the attacker earlier Tuesday. The shop was a "center for incitement," where videos were filmed to "encourage terrorism," according to a police statement.
The current wave of Israeli-Palestinian violence began just over a year ago, and in that time, 36 Israelis and two visiting Americans have been killed in Palestinian attacks. During the same time, about 219 Palestinians have been killed by Israeli fire.