Shots fired in German city of Cologne - Bild newspaper

BERLIN (Reuters) - Shots were fired outside a building in central Cologne on Friday and one suspect has been detained, Bild newspaper reported on its website.

Police cannot rule out there might be additional gunmen, the tabloid added.

Police advised on Twitter to stay away from the area near the central train station and landmark Cologne Cathedral as they prepared to search the building with special units.

(Reporting by Thomas Seythal; Editing by Maria Sheahan)