New Delhi, Jan. 1 -- Thieves stole tens of millions of euros worth of property from safety deposit boxes inside a German bank vault that they drilled into Monday during the holiday lull, police said.

Some 2,700 bank customers were affected by the theft in Gelsenkirchen, police and the Sparkasse bank said.

Thomas Nowaczyk, a police spokesperson, said investigators believe the theft was worth between 10 and 90 million euros ($11.7 to 105.7 million).

German news agency dpa reported that the theft could be one of Germany's largest heists.

The bank remained closed Tuesday, when some 200 people showed up demanding to get inside, dpa reported.

A fire alarm summoned police officers and firefighters to the bank branch shortly before 4 a.m. Mo...