Czech Prime Minister Petr Necas has announced that he will resign on Monday after days of political turmoil.
His ruling coalition will try to form a new government led by someone nominated by his Civic Democratic Party (ODS).
Pressure had been growing on Mr Necas to quit since prosecutors on Friday charged his chief of staff Jana Nagyova with corruption and abuse of power.
Two former MPs, an ex-minister and the current and former heads of military intelligence have also been detained.
All except one have been remanded in custody.
President Milos Zeman has said the charges, brought after armed police raids on government and private offices on Wednesday, are "serious".
Up to 150m koruna (£5m; $8m) in cash, tens of kilograms of gold and large quantities of documents were seized during the raids.http://www.bbc.co.uk/news/world-europe-22930710