German police Thursday detained two men suspected of planning "a serious act of violence representing a danger for the state" in a series of anti-terror raids in Berlin. The two individuals, aged 28 and 46, had been "in contact with the Islamist movement," police spokeswoman Patricia Braemer said, adding that no arms or explosives had been found in the operation. The raids, involving special forces police and sniffer dogs, targeted first an Islamic cultural centre in western Charlottenburg district, and then a building in the southern suburb of Britz. "In connection with this threat, two men were detained in #Britz," tweeted Berlin police, adding in another message that "during a search of their vehicle, a suspicious object was found". The men were aged 28 and 46, reported national news agency DPA. Police also tweeted that in Britz, "some houses are currently being evacuated as a precaution for the forensic examination of the suspicious object". Bild newspaper reported that police had acted on a tip-off that an attack was being planned, as European police forces are on high alert following the November 13 attacks in Paris that killed 130 and injured many more.