N-tv television and the Bild newspaper said the accidentoccurred in snowy weather on Thursday morning when around 400 federal police officers were conducting a training exercise on dealing with football violence.
Footage on n-tv showed at least one helicopter on its side on the ground.
More top news
A suicide bomber detonated a device at a security checkpoint in northern Baghdad killing 12 people and wounding 32 others.
Selena Gomez said she needs to "rethink some areas of my life" as she feels "extremely unauthentic" and "unconnected" to her music.
Although it may be a dry and bright start for most, thicker cloud and rain will spread in through the day.