The cyber crime team of Cyberabad Police arrested prime accused Udunna Chukwuma Collions, Adevayo Olabanji and six others in connection with the case.
The woman lodged a complaint with police in August this year stating that she had registered her details with 'Simply Marry' matrimonial website.
In February last year, she got a marriage proposal from a member of the same portal by name Garry Philles. Both of them exchanged their email IDs and they discussed about themselves and their families, police said.
"The accused showed genuine interest in meeting her and her parents and offered to come to Hyderabad before leaving for the US and to settle the marriage proposal," police said.
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In the meanwhile, the woman went to UK in April this year and asked Garry to meet her there, though he did not meet her. They finally decided to meet in India after the woman returned in June.
"The prime accused contacted the victim over phone and made her believe that if she did not pay the money, a case will be registered against him and also her," police said.
Another accused Adevayo contacted the victim posing as a RBI officer and allegedly made her to deposit Rs 5.4 lakh into the bank accounts provided by the remaining accused.
During course of investigation, a police team nabbed the eight Nigerians on October 8 from Delhi.
On verification, none of the accused persons were found to possess valid original travel documents, police said.