Israel has vowed retribution against Hamas, the militant Palestinian group it says kidnapped and murdered three teenagers in the occupied West Bank. The bodies of Naftali Frenkel, Gilad Shaar and Eyal Yifrach were found on Monday evening, after they had been missing for more than a fortnight. Israel PM Benyamin Netanyahu said: ‘Hamas is responsible and Hamas will pay.’ Hamas denies any involvement. Israel launched more than 30 air strikes on the Gaza Strip overnight. The strikes came in response to 18 rocket attacks on southern Israel from Gaza since Sunday night, the Israeli military said. Israeli troops also flooded into the Palestinian town of Halhul. The bodies were found under a pile of rocks near the town. An Israeli official said it appeared the teenagers were shot soon after their abduction. (See also Prayer Alert 23-2014) Tensions rise further after Israeli police found the body of a Palestinian teenager on Wednesday, apparently a revenge attack.