Meanwhile, Palestinian group Fatah said Israel's denial of Palestinian rights was the cause of such attacks.
Surveillance footage spread online that appeared to show the Palestinian fleeing the site with a gun.
IDF spokesman Brig Gen Ronen Manelis said the Shin Bet internal security service had concluded that the attack was an act of terrorism, but added that the gunman might have had "additional motives" that were not nationalistic.
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Reports suggest four GRU officers set up hacking equipment in the boot of a vehicle parked in the OPCW's offices in The Hague. GRU operatives are also said to be behind the attempted hacking of the World Anti-Doping Agency in Switzerland a year ago .
While insisting the attack was an act of terrorism, he acknowledged there were "other factors involved as well", without elaborating. The terrorist, armed with a homemade weapon, tied up a man and a woman and killed them execution-style.
Meanwhile, the third Israeli settler, who was shot and severely injured in her stomach, was transferred to to the Beilinson Hospital at the Rabin Medical Center to receive medical treatment and is reported to be in moderate condition. "I am sure we will catch him and bring him to justice soon".
Speaking at the beginning of the weekly cabinet meeting, Benjamin Netanyahu called the shooting "a very severe terror attack".
The Palestinian Islamic Jihad militant group called the attack a "natural response" to Israeli crimes in Gaza, Jerusalem and Khan al-Ahmar, a Bedouin village in the West Bank slated for demolition.
Interpol chief's wife and children guarded by police after threats
In 2014, China worked through Interpol to issue notices for 100 Chinese corruption suspects who fled overseas . The paper, which based its reporting on an unnamed source, said the reason for Meng's questioning was unknown.
Advocates of Israeli settlement policies say the industrial zones are an example of the benefits Palestinians have under Israeli control, including much-needed employment to Palestinians.
Palestinians often face tough choices in finding employment in the economically struggling West Bank and jobs in Israeli settlements can provide steady income.
Most countries consider settlements that Israel has built on land occupied in the 1967 Middle East war as illegal.
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Anthony Pettis has some interesting takes on the wild UFC lightweight title picture going into Saturday's UFC 229 event. I always say you should aim for peace but if you can't aim for peace, aim between the eyes.