New Delhi, April 18 -- United States-based gangster Harpreet Singh, alias Happy Passia, who is believed to be responsible for 14 grenade attacks over the last six months in Punjab, has been detained by the US Immigration department, according to reports. Passia is said to be in the custody of ICE (Immigration and Customs Enforcement) in the US.

Passia is among India's most wanted and carries a reward of Rs.5 lakh on his head, announced by the National Investigation Agency (NIA) in January this year over his alleged involvement in grenade attacks on a house in Chandigarh and police stations in Punjab.

As many as 16 grenade attacks have been reported in Punjab, targeting police posts, religious sites, and residences of public figures, inc...