Germany are in Paris for a friendly against France on Friday night, but their preparations were reportedly disturbed just before lunchtime when they were forced to leave the Molitor hotel, Mirror reported.
"There was a threat and the hotel has been evacuated and cordoned off," Bierhoff told Germany's Express newspaper.
The head of the German football federation (DFB) security team Hendrik Grosse Lefert added that there was no indication of when the squad would be allowed to return to the complex.
"The French police have informed us that an anonymous bomb threat had been made," he said.
"Together with our colleagues, we decided to evacuate the hotel to enable them to go through and examine the rooms and conference rooms thoroughly."
The world champions are going to face France in a repeat of the 2014 World Cup quarter-final.
Germany won that encounter in Rio de Janeiro 1-0 thanks to a goal from Mats Hummels.