Muslims use furniture to destroy the furniture at migrant registration center in Dortmund, Germany.

From Express.UK:

Police are so far at a loss to explain the eruption of violence which comes at a tense time in Germany.

The government of Chancellor Angela Merkel is under increasing pressure to both reduce refugee numbers and vet the bona fides of those already in the country following a week of violence that saw a migrant attack people on a train and another blow himself up in the town of Ansbach.