Story highlights Israeli military: 10 sites targeted in Gaza "following constant rocket fire"

16-year-old Palestinian Mohammed Abu Khedair was burned alive, prosecutor says

Spokesman for Israeli PM says Israel is aggressively investigating the killing

His U.S. cousin was beaten a day later by uniformed men, relatives say

Mohammed Abu Khedair , a Palestinian teenager who was abducted and killed in Jerusalem this week, died from being burned alive and hit on the head with a blunt object, according to Palestinian General Prosecutor Mohammed al-Auwewy, citing a medical autopsy.

Al-Auwewy said the autopsy discovered traces of smoke inside the lungs of the 16-year-old, indicating that it was inhaled while the fire was burning.

Mark Regev, spokesman for Israeli Prime Minister Benjamin Netanyahu, said his country is aggressively investigating the killing. "We'll get to the bottom of it and catch those responsible," he told CNN on Saturday.

The teenager's death sparked widespread outrage among Palestinians, many of whom believe he was killed in retaliation for the abduction and killing of three Israeli teens . Israeli authorities are investigating who killed Khedair and why, said Netanyahu

After the Palestinian teen's funeral on Friday, more than 60 people were injured in clashes with Israeli security forces in parts of Jerusalem, according to the Palestinian Medical Relief Society, a group that said it was involved in evacuating injured Palestinians. It said the injuries mostly involved rubber bullets fired at the upper body and chest.

JUST WATCHED Clashes follow Palestinian teen's funeral Replay More Videos ... MUST WATCH Clashes follow Palestinian teen's funeral 01:43

Israeli police said 13 of their officers were slightly injured in clashes in the Jerusalem neighborhood of Shuafat, where Palestinian protesters were throwing rocks at police, who responded by firing rubber bullets and tear gas.

Photos: Israel mourns 3 dead teenagers Photos: Israel mourns 3 dead teenagers Israel mourns 3 dead teenagers – Mourners of Eyal Yifrach, 19, attend his funeral outside his house in Elad, Israel, on Tuesday, July 1. The bodies of Yifrach and two other Israeli teenagers, Naftali Frankel and Gilad Shaar, were found a day earlier after they were abducted last month on their way home from school in the West Bank. Hide Caption 1 of 6 Photos: Israel mourns 3 dead teenagers Israel mourns 3 dead teenagers – Avi and Rachel Frankel attend the funeral of their son, Naftali, in the West Bank settlement of Nof Ayalon on July 1. He was 16. Hide Caption 2 of 6 Photos: Israel mourns 3 dead teenagers Israel mourns 3 dead teenagers – Friends of Naftali Frankel attend his funeral service. Hide Caption 3 of 6 Photos: Israel mourns 3 dead teenagers Israel mourns 3 dead teenagers – Mourners gather around the body of Gilad Shaar, 16, during his funeral ceremony July 1 in Talmon, West Bank. Hide Caption 4 of 6 Photos: Israel mourns 3 dead teenagers Israel mourns 3 dead teenagers – A young man grieves during Shaar's funeral. Hide Caption 5 of 6 Photos: Israel mourns 3 dead teenagers Israel mourns 3 dead teenagers – People hold Israeli flags during Shaar's funeral procession in Hashmonaim, West Bank. Hide Caption 6 of 6

JUST WATCHED Palestinian teen's killing sparks outrage Replay More Videos ... MUST WATCH Palestinian teen's killing sparks outrage 03:36

JUST WATCHED Tensions high after Palestinian teen's death Replay More Videos ... MUST WATCH Tensions high after Palestinian teen's death 03:54

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Meanwhile, a 15-year-old cousin of Khedair is at the center of a new controversy that's become an international incident.

Tariq Khdeir, 15, a high school sophomore in Tampa, was visiting his Palestinian relatives in Jerusalem when he was attacked and detained, relatives told CNN. The family claims that Khdeir is seen in separate videos being held down and pummeled by men in the uniform of Israeli security forces.

Israel's Justice Ministry is investigating an incident that U.S. State Department spokeswoman Jen Psaki called "troubling."

Rockets from Gaza get Israeli response

Khedair's death has raised the ire of many Palestinians in Jerusalem.

But that city is hardly the only place in the region that's fraught with tension.

Gaza and Israeli communities within rocket's reach have seen plenty of intermittent violence in recent weeks.

This comes after Israeli authorities blamed Hamas -- the Islamist militant group that controls Gaza -- for the kidnapping and killing of the three Israel teens whose bodies were found earlier this week.

Hamas has praised the kidnappings of the Israelis but denied that it was responsible for what happened. It also warned if Netanyahu "brings a war on Gaza, the gates of hell will open to him."

While it could still ratchet up significantly, the dangerous back-and-forth between the two sides continued this weekend.

That includes more Israeli warplanes striking targets in Gaza, as well as more rockets being fired across the border into Israel early Sunday morning.

Israel Defense Forces said in a press release that "following constant rocket fire at (southern) Israeli communities," its aircraft targeted 10 "terror sites" in central and southern Gaza. The targets included "concealed rocket launchers and a weapon manufacturing facility," the military said.

And on Saturday, Israeli military aircraft targeted a militant in southern Gaza who earlier in the day fired rockets at the town of Ofakim in southern Israel, IDF said in a statement.

Initial indications suggest that three rockets were intercepted above the area of Ashkelon, the military said.

At least 14 rockets have been fired at Israel since midnight Saturday with one being intercepted by Israel's Iron Dome above Be'er Sheva, according to IDF.

Twelve rockets landed in Israeli territory and another fell in Palestinian territory.