Bomb - making materials were found at premises used by a terror suspect , prosecutor says . ` ` We are clearly ... facing a terrorist act of an extreme nature , '' he says . 12 suspects held in connection with the inquiry are being detained for an extra 24 hours . The arrests are connected to the bombing of a Jewish synagogue in Jerusalem .
Bomb-making materials were found at premises used by a terror suspect , prosecutor says . `` We are clearly ... facing a terrorist cell of an extreme dangerousness , '' he says . 12 people held in connection with the inquiry are being detained for an extra 24 hours . The arrests are connected to the bombing of a Jewish supermarket in September .