IS Fighter Returns to Mumbai, is Being Questioned: Sources

The news agency quoted the Mumbai police as saying that the 22-year-old is being interrogated by members of the country's top counter-terrorism arm, the National Investigating Agency (NIA).

No case has been registered against him.

Mr Majid, along with three other young Muslim men, disappeared in May from their homes in Kalyan, a suburb on the Eastern outskirts of Mumbai.

Three in the group were allegedly trained engineers. The men had allegedly been recruited over the internet by the hardline Sunni Islamic State, which now controls large swathes of territory in Iraq and Syria.

"The men next contacted their families a few days later from Baghdad, where they had traveled as part of a religious tour group. Six days later, they broke off from the group and never returned. Alarmed, Mr. Majeed's father filed a missing persons report with the police. In a letter left behind for his family, one of the men asked for forgiveness and said he would next see them in heaven," reported the New York Times in August.

Some of the country's top intelligence and security officials have, in recent months, have warned of the possibility of the Islamic State recruiting young volunteers on line. "ISIS has the capacity of attracting young men and that is a concern for us," said Lieutenant General Subrata Saha last month; he is the Commanding Officer of the Chinar Corps or 15 Corps tasked with guarding the border with Pakistan in Kashmir, where IS flags have been seen sporadically at rallies.