Germany has arrested three men it suspects of planning “massive bomb attacks” on U.S. installations and belonging to a domestic cell of the Islamic Jihad militant group, German officials said on Wednesday. Federal prosecutor Monika Harms said the men, two German nationals and one Turk, had obtained enough materials to make a bomb with an explosive power equal to 550 kg. of TNT and that an attack appeared imminent. Harms could not confirm reports that the accused were targeting the Frankfurt airport and U.S. military base in Ramstein, but said they had been observed scouting out U.S. installations such as discos, pubs, or airports. Earlier this year the accused men acquired 12 vats and a hydrogen peroxide solution used in bomb-making.