The Indian Mujahideen module, which sent the terror mail claiming responsibility for the Varanasi blast, had hacked into a broadband Internet connection of a Navi Mumbai resident. Police sources said that the Wireless Fidelity (WiFi) that was used to send the five-page email was traced to a house in sector 17, Vashi in Navi Mumbai. The sources said that the house owner's insecure WiFI was hacked into. Mumbai Police had picked up a father-son duo for questioning in Mumbai in connection with the e-mail sent by banned terror group Indian Mujahideen.Terrorists of Indian Mujahideen have been using unsecured WiFi connections for sending mails to media houses within minutes of blasts taking place.Meanwhile, Maharashtra's Home Minister, RR Patil said no one has been detained so far and the inquiry is on.