Berlin: "Extremely violent" Borussia Dortmund fans attacked terrified children and women from visiting RB Leipzig and police made 28 arrests including for possession of explosives, German authorities said.

A crowd of 81,360 saw Dortmund's 1-0 home win over second-placed RB Leipzig on Saturday, but there were ugly scenes outside Borussia's Signal Iduna Park stadium before kick-off when some of the 8,500 visiting fans were attacked. "In the build-up to the match, in the Strobelallee area (outside the ground), RB Leipzig supporters were bombarded with stones and cans from Borussia Dortmund fans," police said in a statement.