"There's no difference between a Jewish resident of Jerusalem or an Arab resident of Jerusalem," the spokesman said. "... Police will get to the bottom of this."
"It is sickening to think of an innocent 17-year-old boy snatched off the streets and his life stolen from him and his family," said Secretary of State of John Kerry, who talked with Netanyahu by phone about the situation. "There are no words to convey adequately our condolences to the Palestinian people."
He noted that both Israeli and Palestinian officials have condemned it, and he added to Netanyahu's call. "Those who undertake acts of vengeance only destabilize an already explosive and emotional situation."
Palestinian Authority President Mahmoud Abbas, who heads the Fatah party and is based in the West Bank, called Mohammad Abu Khedair's father and promised that those behind his abduction and death will be brought to justice, WAFA, the Palestinian state news agency, reported.
And Hamas -- the militant Islamic organization that controls Gaza -- said in a statement that it holds the "Israeli occupation (fully) responsible," adding that the incident "exposes (Israel's) ugly ... racism" and "refutes the Israeli narration of being the victim all the time."
Anger, clashes in Palestinian neighborhoods of Jerusalem
As news of the boy's death spread, public anger in Palestinian neighborhoods of Jerusalem rose to levels rarely, if ever, seen since the Second Intifada, or uprising, last decade.
That led to several clashes around the city, the biggest of which was centered in Shuafat.
Residents there threw stones at security forces and the Israeli authorities responded with occasional volleys of stun grenades or tear gas. Some protesters attacked two Palestinians whom they mistook for undercover Israeli police, The Jerusalem Post reported.
The clashes expanded and continued through midnight in the Palestinian neighborhood, with a large amount of Israeli forces on hand.
In Suwwaneh, Palestinians threw rocks at a nearby settlement and several of them were injured by rubber bullets, witnesses said. And some tossed Molotov cocktails at an Israel settlement in Silwan, outside Jerusalem's Old City.
The Palestinian Red Crescent Society reported that more than 100 were injured, most of them in Shuafat, in the clashes.
There were concerns that the Palestinian teenager's funeral could spark further unrest. But his father said Thursday he was still waiting to hear from Israeli authorities when the body would be handed over to the family.
"The autopsy should be done around 1 p.m., and then I am supposed to wait for a call," Hussain Abu Khedair said on Palestinian television.
"We will not bury my son at night," he said. "We will do it during the day. If they purposely delay, we will do it during the day even (if that means) tomorrow."
Israeli airstrikes into Gaza
Meanwhile, the dangerous back-and-forth between Gaza and Israel was erupting yet again.
Rockets from the Palestinian territory into Israel was met by at least eight airstrikes within about an hour early Thursday.
Three hit a Hamas intelligence building in Gaza city, while at least one struck the Qassam training camp in Beit Hanoun.
Palestinian medical sources reported at least 10 injured, one of them seriously.