German police raided mosques and Islamic community centers in two southern German states on Friday as part of a widespread effort to track Islamic extremist networks. In Baden-Württemberg, some 400 police officers searched 18 buildings, checking occupants' papers, the state Interior Ministry said in a statement. "The goal is to continue an intensive fight against criminal Islamists and to uncover the networked structures of Islamic extremists and terrorists," the statement said. No arrests were announced. In parallel raids in neighboring Rhineland-Palatinate, some 230 police officers questioned 235 people and searched over 100 vehicles." Five people were arrested on suspicion of being illegal immigrants.