Israeli police stepped up security measures in Arab neighborhoods in East Jerusalem on Monday, searching trucks and arresting relatives of the Palestinian truck driver who rammed his vehicle into a crowd of Israeli soldiers at a Jerusalem tourist spot the previous day, killing four soldiers and injuring 17 others.

Nine people were arrested, five of them relatives of 28-year-old Fadi Qunbar, the attacker. All arrested were from the Jabel Mukaber neighborhood of east Jerusalem where Qunbar lived, police said.

Police forces checked drivers and searched parked cars and trucks throughout east Jerusalem in an effort to prevent copycat attacks, police spokesman Micky Rosenfeld said.

An investigation was underway as to how Qunbar managed to make his way on Sunday to the Jerusalem promenade where the soldiers gathered, who owned the truck he drove and whether he planned his attack ahead of time, Rosenfeld said.

Israeli Prime Minister Benjamin Netanyahu said authorities would increase the number of concrete barricades along Jerusalem roads where pedestrians gather, to protect them from similar attacks by vehicles, and that Israeli security agencies are working on ways to detect attackers ahead of time.

"We are under a new kind of attack, the lone attacker that gets inspiration and decides in a moment to act," Netanyahu said.

Mohammed Qunbar, the attacker's cousin, said Fadi lived a normal life but carried out the attack as a result of Palestinian anger over what is seen as Israeli encroachment at Jerusalem's most sensitive holy site. Jews revere it as the Temple Mount, and Muslims call it the Noble Sanctuary and the site of the al-Aqsa Mosque. It has been a frequent scene of violence in the past, as Palestinians have accused Israel of secretly plotting to take over the site, which Israel denies.

(China Daily 01/10/2017 page12)