The Colaba police have registered a cyber fraud case against unknown persons, while a parallel investigation has been launched by the Maharashtra Cyber Cell, based on a complaint filed by a naval staffer who was allegedly duped of Rs 90,811.

According to the police, the fraudsters sent a fake APK mobile application to the 27-year-old naval employee posted at the Naval Dockyard in Colaba, gaining unauthorised access to his mobile phone and misusing his credit cards.