Spanish authorities say tax inspectors have searched the home of Rodrigo Rato, a former head of the International Monetary Fund and one-time senior member of government in Spain.

The Madrid regional court said in a statement Thursday that a judge granted a request from the tax authorities to enter and search Rato's house in Madrid as part of a legal case that officials are building. It provided no further details, saying the investigation is secret.

Rato headed the IMF from 2004 to 2007. Before that, he was a prominent member of Spain's Popular Party, whose reputation has recently been damaged by a series of corruption scandals.

Rato is also under investigation for his former role as a director of Spanish bank Bankia, which had to be bailed out in 2012.