Sahil Khan and three others.
They have been instructed to appear before the SIT on Friday for questioning.
Earlier, Dubai Police on Tuesday arrested Ravi Uppal, one of the two prime accused in the Mahadev Book online betting syndicate.
Uppal is also the alleged co-promoter of the app.
According to the sources, the arrest was made by Dubai police based on a red corner notice issued by Interpol at the behest of ED. Uppal will be extradited to India soon.
Uppal is facing a money laundering case being probed by the Enforcement Directorate. He is named as accused in the case in which allegations of kickbacks were made against outgoing Chhattisgarh Chief Minister Bhupesh Baghel.
As per officials, Dubai Police arrested Uppal following a Red Corner notice issued against him at the behest of the Enforcement Directorate.
Sources said that Dubai authorities conveyed this to Indian officials soon after the arrest of Uppal and showed their willingness to deport him, as he is wanted in India for his alleged involvement in money laundering worth nearly Rs 6,000 crore.
Red Corner notices were issued against Uppal and Sourabh Chandrakar, the other promoter and mastermind of the illegal betting syndicate, who is also in the UAE, in October this year.
A Red Corner notice was issued against both of the accused after the Enforcement Directorate moved a special court in Raipur and obtained a non-bailable warrant against them.