Mumbai/Varanasi : An email that claimed responsibility for the Varanasi blast of Tuesday evening was traced to an unsecured Wi-Fi in Navi Mumbai, police said.
While reports said a father-son duo was taken into custody for questioning after the terror mail reached media offices from Indian Mujahideen (IM), according to one TV report the email was sent by Al-Fateh, which could be a front of IM.
It was sent from unsecured Wi Fi and possibly from a mobile phone, reports said.
An 18-month-old girl was killed and at least 25 others were injured in the blast on the banks of the Ganges in Varanasi.
Uttar Pradesh Director General of Police Karamvir Singh said according to preliminary investigation the explosive was kept in the wall between two ghats.
The stampede that followed the explosion, collapsing a railing on the ghat, added to the injured toll while the explosion itself was a ?medium-intensity? blast, authorities said.
The explosion took place around 6:30 pm at the Sheetla Ghat, where over 5,500 people had gathered to watch the ?Maha Aarti? and offer prayers.
According to reports four foreigners are among those injured.
Major cities including Mumbai, Delhi, Hyderabad and Bangalore have also been put on alert.