Around 5,000 people joined a Berlin demonstration on Sunday by a controversial protest group which dug mock graves in front of parliament to highlight Europe's deadly migration crisis, police said.

The political art group calling itself "Centre for Political Beauty" had planned to march to Chancellor Angela Merkel's offices with what it said were the corpses of dead migrants and bury them outside.

After the Berlin authorities barred them from carrying out the plan, they knocked down security barriers in front of the nearby Reichstag parliament building.

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