Lahul, Fatima and Yamin were arrested from Seemapuri area of north east Delhi, said Ajit Kumar Singla, DCP (north east).
On June 17, an FIR was registered at Seemapuri police station by Mirza Beg that one Salim came to him on June 13 and offered US dollars at very cheap rates. He took Mirza to a lady who showed him US dollars kept in a bag.
Mirza gave her Rs 2 lakh and took the bag which he later found was "packed with ordinary paper".
Further investigation is on to arrest other members of the gang, he added.