Germany's vice-chancellor is visiting a refugee shelter that was attacked by far-right protesters over the weekend.

Sigmar Gabriel is meeting Monday with local officials at the repurposed hardware store in Heidenau, south of Dresden.

Police say more than 30 officers have been injured trying to protect the site from neo-Nazi rioters since Friday.

On Sunday, left-wing protesters clashed with neo-Nazis and police in Heidenau.

Attacks against refugees and asylum centers in Germany have increased sharply over the past year. Officials say there were some 202 such attacks in the first six months of 2015, as many as during the whole previous year.

Police in southwestern Germany said Monday they are investigating a possible arson attack against an empty building destined as a refugee in the town of Weissach im Tal.