German authorities are investigating a second spy case reportedly involving the U.S., a week after the arrest of a German intelligence employee, AP reported. Federal prosecutors said Wednesday that police raided properties in the Berlin area on "initial suspicion of activity for an intelligence agency." They did not elaborate or specify what intelligence agency was involved, but said they had not made an arrest. "We have investigations in two cases of suspected espionage, a very serious suspicion," government spokesman Steffen Seibert told reporters in Berlin. He declined to provide further details, citing the ongoing investigations.