Story highlights The four slain soldiers were identified and posthumously promoted

Israeli police identify the suspect as Fadi Qunbar, 28, from East Jerusalem

Jerusalem (CNN) The driver who plowed a truck into a group of soldiers in Jerusalem, killing four people and injuring at least 10, may have been an ISIS sympathizer, according to Israeli Prime Minister Benjamin Netanyahu.

Two soldiers and a tour guide who is a colonel in the reserves shot and killed the attack suspect, whom they identified as 28-year-old Fadi Qunbar. Police have also arrested nine other suspects, including five of Qunbar's family members.

Speaking from the scene of the attack, on a promenade overlooking the walled Old City of Jerusalem, Netanyahu said authorities have identified the terrorist and "all signs show he is a supporter of the Islamic State."

Photos: Deadly truck attack in Jerusalem Israeli security forces gather around a flatbed truck at the site of a vehicle attack in Jerusalem on Sunday, January 8. Hide Caption 1 of 9 Photos: Deadly truck attack in Jerusalem A truck plowed into a group of soldiers in Jerusalem Sunday, killing four and injuring at least 13. Hide Caption 2 of 9 Photos: Deadly truck attack in Jerusalem The white truck at right was the one used in the attack. Hide Caption 3 of 9 Photos: Deadly truck attack in Jerusalem Israeli soldiers console each other at the site of the attack, which occurred on a popular promenade overlooking the walled Old City of Jerusalem. Hide Caption 4 of 9 Photos: Deadly truck attack in Jerusalem Israeli security forces and emergency personnel gather at the site of the vehicle attack. The attacker was shot and killed; note the bullet holes in the truck's windshield. Hide Caption 5 of 9 Photos: Deadly truck attack in Jerusalem A distraught Israeli soldier is consoled at the site of Sunday's attack. Hide Caption 6 of 9 Photos: Deadly truck attack in Jerusalem A group of soldiers had gotten off a bus and were getting organized with their bags when "the terrorist took the opportunity, ramming his truck into the group," Israel Police spokesman Micky Rosenfeld said. Hide Caption 7 of 9 Photos: Deadly truck attack in Jerusalem Israeli medics carry a covered body from the scene of the attack. Hide Caption 8 of 9 Photos: Deadly truck attack in Jerusalem Israeli Defense Minister Avigdor Lieberman, center right, and Prime Minister Benjamin Netanyahu visit the site of the attack. Hide Caption 9 of 9

"We know there is a sequence of terror attacks and it's quite possible that there is a connection between them, from France, Berlin and now Jerusalem," Netanyahu said.

Israel will now consider using administrative detention against suspected ISIS sympathizers and supporters, according to an official familiar with the decision. Earlier, Israel Police spokesman Micky Rosenfeld told CNN "there are no potential active ISIS cells here in Israel."

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