were found dead. >> hamas is responsible, hamas will pay, hamas will continue to pay. >> reporter: though hamas denied in the role in the killings, israelis arrested hundreds of palestinians, and launched air strikes in gaza. days later, a 16-year-old palestinian boy was burned alive, an apparent victim of revenge for the dead israeli teens. >> they called the arabs models, and vice versa, and there was a human empathy and understanding on both sides. >> reporter: then a video showing his american cousin brutally beaten by israeli police. >> translator: the israeli government today is responsible for all that happens. >> reporter: riots and clashes rocked the west bank and jerusalem. hamas rockets flying into israel were met by more israeli air strikes. >> translator: we are in the