German police are appealing for help in finding several Dutch nationals suspected of involvement in a multi-million euro bank card forgery ring.

The gang is thought to have got away with almost €30m in just one day in February by using faked bank cards to withdraw money from cashpoint machines in 23 different countries.

The thieves hacked into computers at various companies which eventually took them back to a security system operated by a bank in Oman. Using the information, they were able to fake bank cards and credit cards, Dutch police say.

Two Dutch nationals – a 56-year-old woman and her 35-year-old son – have been arrested in Dusseldorf and remain in custody. A Greek national was arrested in The Hague.

German police have now circulated photographs of the suspects, and say several are thought to have Dutch nationality.