There are surveillance cameras at Bonn station, but none of them managed to record footage of the attempted attack, which happened on Dec. 12, Deutsche Welle reported.
"You can plaster the entire city of Bonn with cameras but if they don't work then that's good for nothing," Cem Ozdemir, chairman of Germany's Green Party told Deutsche Welle.
Interior Minister Hans-Peter Friedrich called for an expansion of video surveillance in public places in Germany as investigators in the case are mostly working from witness statements and security footage from a camera in restaurant on the platform.
Not all think extra cameras would be better for the city, though.
Charles Farrier, who runs the organization No-CCTV, said the idea of more surveillance cameras is a nightmare.
"If you invite someone from outside the U.K. to walk around a major city center, nine times out of 10, they'll be shocked by the number of cameras," he said.
Frank Neubacher, of the Institute for Criminology at Cologne University, agreed that more cameras in public places "is not a guaranteed recipe to prevent or solve crimes."