On 17 December 2013, a wave of arrests targeting businessmen, bankers and most notably the sons of four serving cabinet ministers in Erdoğan's government were arrested during an anti-corruption operation.[50] The allegations that a banknote counting machine had been found in serving Interior Minister Muammer Güler's son's house, as well as the revelation that large amounts of money had been hidden in shoe boxes in the house of the CEO of Halkbank caused a media storm.[51][52] A total of 80 people were arrested, with 24 formally charged.[53]