Weekly newspaper Die Zeit has revealed that East German secret security force the Stasi was given access to buildings in West Berlin for almost two decades by a West German locksmith.

The Local online reports that copies of special security keys to police stations, hotels, vehicles, traffic light boxes and broadcaster ARD were handed over to the Stasi from the mid 1970s until reunification. According to Die Zeit, the agent was sentenced to 18 months probation when he was finally discovered.