Israeli Prime Minister Benjamin Netanyahu promised on Sunday to fight what he termed domestic terrorism after authorities said young thugs beat to death a man who was strolling along a Mediterranean beach with his family, Reuters reported.
Police said they arrested 10 people, all under the age of 22, suspected of killing 59-year-old Leonard Karp on Friday.
Karp's wife and daughter were also attacked on a Tel Aviv beachfront but managed to flee and call for help.
Police would not comment on a motive for the killing. Media reports said the youths had been drinking or taking drugs and had argued with Karp before assaulting him.
The attack was front-page news in Israel, two weeks after a gunman shot dead two people at a gay and lesbian centre in Tel Aviv, Israel's most freewheeling city. No one has been arrested in the suspected hate crime.
Netanyahu, in an interview on Army Radio, said that in light of the recent killings, the government would "strengthen urban policing".
"Personal safety is not just against terrorists," he said, using the term to refer to Palestinians who attack Israelis, "but against the domestic terror of crime, as well."
Internal Security Minister Yitzhak Aharonovitch told reporters it was "inconceivable that an innocent person could be strolling with his family and be beaten to death by a group of thugs".