Thieves used a large drill to break into a safe at a high street bank branch in western Germany and steal an estimated €30m (£26m; $35m) in cash and valuables. A police spokesman likened the break-in to the Hollywood heist film Ocean's Eleven, telling AFP news agency it was 'very professionally executed.' During the heist at Sparkasse savings bank in the city of Gelsenkirchen, thieves broke open more than 3,000 safe deposit boxes containing money, gold, and jewellery. Gelsenkirchen Police said they became aware of the crime after a fire alarm was set off in the early hours of Monday morning. Currently, no arrests have been made, and the perpetrators remain at large. Police said the thieves had used the 'quiet Christmas days' to rob the building on Nienhofstrasse in the Buer district. Initial investigations suggest they gained access to the bank, and escaped, via an adjacent parking garage. Witnesses reported seeing several men carrying large bags in the staircase of the garage overnight on Saturday into Sunday. Police said video footage shows a black Audi RS 6 leaving the garage early on Monday morning. The hole into the underground vault room was discovered when a fire alarm went off, prompting a search by police and the fire brigade. Affected bank customers have been asked to contact Sparkasse bank, which has set up a hotline. Customers gathered outside the branch seeking information following the robbery. A message on the bank's website stated the branch would remain closed on Tuesday. Sparkasse indicated that 95% of customers' safe deposit boxes had been forced open, heightening the likelihood that they were affected. The bank reassured customers that the contents of each compartment are insured up to €10,300 and advised checking for additional coverage through home insurance.