Israeli terrorist group claims responsibility for Israel attack , official says . Concerns growing about extremist activities in Gaza , officials say . A rocket is launched from Sinai , but no injuries are reported , Palestinian police say . Bedouin tribes have kidnapped a number of tourists in the past months , seeking the release of fellow tribesmen detained in prison . Attack will not deter border fence project , Sinai 's prime minister says .
Israeli terrorist group claims responsibility for Israel attack , official says . Concerns growing about extremist activities in Gaza , officials say . A rocket is launched from Sinai , but no injuries are reported , Palestinian police say . Attack will not deter border fence project , Sinai 's prime minister says .