German banking giant Deutsche Bank said today it has gained control of Postbank after having launched a public offer for shares in the country's leading retail bank.

Deutsche Bank, which owned just shy of 30% in Postbank, said in a statement it had acquired at least another 21.48% of the bank's shares, taking its holding to over 50%.

Deutsche Bank said it plans to temporarily sell some shares to reduce its holding back below 50% until it gets formal approval for the acquisition from competition authorities in the US, where its stock is also listed.

'Nevertheless we don't have to wait for the green light from the US to begin working on the consolidation of Postbank,' a Deutsche Bank spokesman said.

The acquisition of Postbank, which with around 14 million clients is the leading retail bank in Germany, will allow Deutsche Bank to take a large step forward in its plans to diversify its revenue sources.