Devinder Pal Bhullar, a German-based Sikh, was sentenced to death in 2001 for masterminding the bombing, which killed nine people. The bomb targeted Maninderjit Singh Bitta, a leader of the ruling Congress Party and a critic of militant separatists in Punjab.
India's Supreme Court rejected a plea to commute the sentence to life imprisonment in April this year and upheld its decision on August14, the ICJ, an international group of 60 lawyers and judges, said in a statement.
The ICJ's South Asia Director Ben Schonveld said there were serious questions about Bhullar's trial.
"His conviction and death sentence are based solely upon an alleged confession he made in police custody, which he later retracted, claiming it was extracted under torture," Schonveld said in the statement.
In a separate statement, Amnesty International said one of the three judges at Bhullar's trial had found him not guilty, saying there was no evidence to convict him.
It also said international standards prohibited the use of the death penalty against people with mental disability, and Bhullar had reportedly been suffering from psychosis and severe depression and had suicidal tendencies.
India ended an eight-year moratorium on the death penalty in November 2012 with the hanging of Ajmal Kasab, the lone survivor of the gang of militants who killed 166 people in a rampage through Mumbai.
India also hanged Mohammad Afzal Guru in February this year for an attack on India's parliament in 2001. The execution sparked clashes between protesters and police in Kashmir in which dozens were injured.
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wonder why this criteria was not applied in afzal guru case.i am not defending afzal...but pointing to the fact that such kind of double speak would justify a particular community's claim of being singled out for repression.
Some countries follow the 'practice' of not hanging or executing convicts who are clinically diagnosed as "mentally retarded". However I do not feel this mastermind behind the bombing years ago should be pardoned just because he has "suicidal tendencies" and is suffering from "severe depression". Think before you commit a crime which costs others' lives. I do not understand why convicted criminals are even kept alive for years in India; they should be executed as soon as they are found to be guilty.