Senior Samajwadi Party leader Amar Singh and his wife Pankaja Kumari Singh have been booked for alleged financial fraud amounting to about Rs 500 crore, a senior police officer said here on Friday.

An FIR was lodged yesterday at Babupurwa police station in Kanpur, accusing the SP general secretary and his wife of amalgamating companies for converting black money into white, Additional Director General of Police (Law and Order) Brij Lal said.