A trip to visit family in Jerusalem turned into a nightmare for a Florida teenager who found himself beaten and in the middle of clashes between Israelis and Palestinians.

Palestinian President Mahmoud Abbas met Monday with the teenager who allegedly was beaten by Israeli police last week, and Jewish leaders in Baltimore condemned the alleged abduction and killing of his cousin by several Israelis.

In Israel, meanwhile, Hamas stepped up rocket fire at southern towns, and the government called up reserve troops in anticipation of a possible escalation of hostilities with the Islamist group that dominates the Gaza Strip.

Relatives of 15-year-old Tariq Abu Khdeir, a Baltimore native who is visiting family in Israel with his parents and two younger sisters, say he was watching a protest leading up to the funeral of his cousin in East Jerusalem last Thursday when he was detained by Israeli police.

The killing came in apparent retaliation for the abduction and killings of three Israeli teenagers in the occupied West Bank. Israel blames their deaths on Hamas.

Tariq's relatives say he is the youth in a pair of videos that have surfaced of the protest. The footage shows two Israeli border police officers holding down and pummeling a masked youth. There is no indication he is resisting. The officers than drag his limp body away.

Photographs of Tariq, who lived in Baltimore and attended John Ruhrah Elementary School before his family moved to Florida, show him with a black eye, a bloodied nose and a badly swollen mouth.

"When I saw his face — it was disgusting to see that," Hakeim Abu Khdeir, a Baltimore cousin, said Monday. "The kid was in cuffs already, and you're still beating him."

Relatives say Tariq was with his 16-year-old cousin Mohammed Abu Khdeir last Wednesday shortly before Mohammed was grabbed by two man, shoved into a car and driven away.

Mohammed's charred body was found in a forest near Jerusalem later that day. An autopsy indicates the youth was likely burned alive.

Israel has arrested six Jewish suspects in the killing of Mohammed, and Prime Minister Benjamin Netanyahu called the youth's father Monday to offer his condolences.

"I would like to express my outrage and that of the citizens of Israel over the reprehensible murder of your son," Netanyahu told Hussein Abu Khdeir, according to Netanyahu's office. "We acted immediately to apprehend the murderers. We will bring them to trial, and they will be dealt with to the fullest extent of the law."

Jewish leaders in Baltimore also condemned the killing.

"The Associated and Baltimore Jewish Council unequivocally condemn the brutal murder of 16-year-old Mohammed Hussein Abu Khdeir on June 2 and offer condolences to the grieving family," the organizations said in a statement. "We are appalled that this heinous crime was allegedly carried out in revenge for the kidnapping and murders of three Jewish teens, Eyal, Gilad and Naftali.

"The murder of innocents is antithetical to Jewish law and tradition and must always be opposed by men and women of decency and morality."

Sen. Ben Cardin, a member of the Senate Foreign Relations Committee, warned that "violence begets only more violence."

"The cycle must be broken," he said. "Innocent children should never be used as targets for violent agendas. Those responsible for the recent murders of Israeli and Palestinian youths should be held accountable for their actions. These tragic events should not be used as justification for additional violence. We cannot lose more of our children to such senseless acts."

Hakeim Abu Khdeir said the family was mourning the death of Mohammed.

"He's just gone," he said. "There's nothing that will bring him back to us."

Tariq was at a protest the day after Mohammed's killing that led to clashes with Israeli police. Police say he attacked officers, resisted arrest and was carrying a slingshot. They say he was arrested along with six other youths, some of whom had knives.

Tariq told reporters after his release Sunday that he had not fought with police.