Anti graft body, the Economic and Financial Crimes Commission (EFCC) on Saturday questioned former Senate President Bukola Saraki over alleged misappropriation of public funds and money laundering.
According to sources who confirmed the news to Channels Television, Saraki arrived the EFCC office around 2pm.
It was not yet clear, as of the time of this reporting, how long he will be held for.
According to sources, Mr Saraki is alleged to have hired suspected proxies, who executed contracts for Kwara State under his administration and allegedly made returns to him for many years.
The funds involved are said to run into hundreds of millions in naira and hundreds of thousands in foreign currencies.
Saraki, 58, was Senate President between 2015 and 2019.
He also sat for two terms as Governor of Kwara State from 2003 to 2011.
As Senate President, Mr Saraki spent a considerable time facing charges of corruption and false declaration of assets, although he was eventually acquitted by the Supreme Court in June 2018.