Sources said that about four locations in Delhi and neighbouring Gurgaon were covered during the searches which are being conducted by the Ahmedabad office of the agency in coordination with their local counterparts here.
"The searches are being conducted on some suspects who acted as bookies during the recent Indian Premier League matches held in the county.
"The probe is being handled by the ED Ahmedabad office, which is investigating the case for hawala and money laundering charges," sources said.
Later, the agency arrested 13 others in connection with the alleged betting racket.
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On March 26, the same office registered a money laundering case against two prime suspects and a few others in an alleged IPL betting racket worth Rs 4,000 crore.
The accused have been charged by ED under Sections 418 (cheating), 419 (punishment for cheating), 420 (cheating and dishonestly inducing delivery of property), 467 (forgery of valuable security), 471 (using forged document as genuine) along with Section 120(b) (criminal conspiracy) of Indian Penal Code.
Locations in Delhi's Karol Bagh, Shastri Nagar and Gurgaon are being searched, they added.