The perpetrators drilled through a thick concrete wall at a branch of Sparkasse bank in the western city of Gelsenkirchen and then broke into several thousand safe deposit boxes and stole a sum estimated in the double-digit millions of euros, the police said in a statement.

Dozens of angry customers gathered in front of the bank on Tuesday loudly chanting “Let us in!.”
“I couldn’t sleep last night. We’re getting no information,” one man told the Welt broadcaster as he waited outside the branch, adding that he had been using the safe for 25 years and that it contained his savings for old age.
Another man said he used his deposit box to store cash and jewelry for his family.
A spokesperson for the Sparkasse bank in Gelsenkirchen did not immediately respond to a request for comment.
Police said witnesses have reported that they saw several men on Saturday night carrying large bags in the stairwell of an adjacent parking garage.
There were also reports of a black Audi RS 6 leaving the garage early on Monday morning with masked men inside. The vehicle’s license plate was that of a car stolen in Hanover, more than 200 kilometers to the northeast of Gelsenkirchen, police said.
A police spokesman described the operation as highly organised, comparing it with a Hollywood-style robbery resembling Ocean’s Eleven.
The break-in was “indeed very professionally executed”, he told the AFP news agency.
“A great deal of prior knowledge and/or a great deal of criminal energy must have been involved to plan and carry this out,” he added.
Police said the average insured value of each deposit box was more than 10,000 euros ($11,700). However, officers said several victims had reported that the contents of their boxes were worth significantly more than the insured amount.
On Tuesday, hundreds of customers gathered outside the bank, demanding answers. The branch remained closed for security reasons after threats were reportedly made against staff.
“I couldn’t sleep last night. We’re getting no information,” one man told the Welt broadcaster, saying he had used the safe deposit box for 25 years and stored his retirement savings there.
Nowaczyk, the police spokesperson, said officers remained at the scene to monitor the situation. “We’re still on site, keeping an eye on things,” he said, adding that “the situation has calmed down considerably”.
The bank said it had set up a hotline for affected customers and would contact them in writing as soon as possible. It added that it was working with insurers to determine how compensation claims would be handled.
“We are shocked,” said bank press spokesperson Frank Krallmann. “We are standing by our customers, and hope that the perpetrators will be caught.”
Police said the suspects remain at large, and investigations are ongoing.
A spokesperson for the Sparkasse bank in Gelsenkirchen did not immediately respond to a request for comment.
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