Amit Chandole was arrested in November last year under the PMLA in a case involving a firm providing security services and others.
Khan said these revelations had repeatedly exposed what he had been saying in his '24-year fight against corruption which is the biggest threat to the country's progress'.
Singh has been the chairman of the Alchemist group and while he resigned from the post in 2012, he is stated to be the Chairman, Emeritus and founder of the business group.
Varsha Raut was grilled and her statement recorded under the Prevention of Money Laundering Act by the central probe agency for the first time on January 4 at its office here.
The former minister, along with others, is accused of raping a woman and attempting to molest her minor daughter.
Referring to the central agency's summons to his wife Varsha in an alleged money laundering case, he also wondered why the ED was now probing cases involving small amounts.
The ED wants to question Varsha Raut with regard to a transaction of about Rs 55 lakh with the wife of a person who is accused in the PMC Bank alleged fraud case.
The UK property market is seen as a particularly attractive area for dubious overseas fund flows.
The three were arrested under various sections of the Prevention of Money Laundering Act on Tuesday and a special court in Hyderabad sent them to 14 days judicial custody.
The ED on Saturday attached residential and commercial properties worth nearly Rs 12 crore of the former chief minister of the erstwhile state in an ongoing case of alleged money laundering.
The total amount involved in the offence of money laundering was Rs 27.05 crore.
Abdullah, who is the Srinagar Lok Sabha MP, is in touch with his lawyers and mulling legal options to fight the charges and attachment of properties.
The warrant was issued against Gupta on August 29 as he did not join the investigation despite receipt of summons and was trying to evade the probe on one ground or the other.
All funds of Campus Front routed through personal bank accounts of Rauf, says agency
The Shiv Sena had earlier called the raids a "political vendetta" and said the Maharashtra government or its leaders will not surrender to pressure from anyone.