Train station in German city of Cologne closed after hostage-taking

Police stand outside Cologne main railway station on October 15, 2018 in Cologne, Germany.
Michael Gottschalk | Getty Images
Police stand outside Cologne main railway station on October 15, 2018 in Cologne, Germany.

The main train station in the western German city of Cologne has been closed due to an ongoing police operation, state-owned rail operator Deutsche Bahn said on Monday after police said they were investigating a suspected hostage-taking.

"A police operation is delaying rail traffic, the main station in Cologne is closed," Deutsche Bahn said on Twitter, adding it did not know how long the police operation would last.