Thomas de Maiziere, Germany's interior minister, said French authorities were informed of the arrest shortly after the man was detained with a stash of weapons and explosives in his car near the Austrian border on November 5.
The man's navigation device contained an address in Paris, he said.
"There is a connection to France but it's not certain that there is a link to this attack," said de Maiziere.
Police in Montenegro said German police informed them they arrested a 51-year-old Montenegrin citizen with "a certain quantity of arms and ammunition" in his car, which was registered in the Balkan country's capital, Podgorica.
"We checked this information and found that 51-year old V V from Podgorica is not known to the police as the perpetrator of serious crimes or violations of public order," Montenegro police spokeswoman Tamara Popovic said in a statement.
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