"Those committing heinous crimes in India will be pursued wherever they may be. Will have Jagtar Singh (Tara) extradited from Thailand," External Affairs Ministry Spokesperson Syed Akbaruddin tweeted.
Gurmeet Singh - alias Jagtar "Tara" Singh - was arrested in the eastern province of Chon Buri yesterday after raiding a house owned by a Pakistani national, Thai National police spokesman Lt Gen Prawut Thawornsiri said in Bangkok.
A 37-year-old former member of the Babbar Khalsa International Sikh separatist group, Singh had entered Thailand in October. He escaped from a high-security prison in 2004 in Chandigarh before being convicted for life in 2007.
A team of provincial police and soldiers raided a house in Bang Lamung district and arrested Singh, one of six Sikh militants convicted for the 1995 blast, that also killed 17 others outside a government complex in Chandigarh.
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Last week, the national police chief had announced that a special unit would be set up to target transnational criminal gangs operating in Thailand or using the country as a shelter.
The Indian government had been in touch with Thai authorities to nab Singh, who had been hiding in Thailand for months and probably under another identity.