DHAKA- Bangladesh hanged Islamist opposition leader Muhammad Kamaruzzaman on Saturday for war crimes committed during the 1971 war of independence from Pakistan, a move met with an angry reaction from his supporters who called for a protest strike.

Kamaruzzaman, 63, of the Jamaat-e-Islami party, was hanged at Dhaka Central Jail after the Supreme Court rejected his appeal against a death sentence imposed by a special tribunal for genocide and torture of civilians during the war.

He refused to beg for a pardon from the president. The head of the jail confirmed that the execution took place at 10:30 p.m. (12:30 p.m. EDT).

The acting head of Jamaat-e-Islami, Maqbul Ahmed, said in a statement: "The government, in a very planned way, killed him in political revenge."

The party declared Sunday as a "prayer day" for Kamaruzzaman and peace and called for a general strike on Monday.

The Border Guard Bangladesh paramilitary force was deployed across the country to stem any sign of protest. All roads leading to the prison were closed on Saturday and security forces patrolled the capital.

Supporters of the sentence were soon out hailing the execution. Across the country, there were several marches calling for the completion of other war crimes cases. Demonstrators offered sweetmeats to each other to welcome the execution.

Prime Minister Sheikh Hasina opened an inquiry in 2010 into crimes committed during the war, paving the way for prosecutions by two war crimes tribunals that Islamists have denounced as part of a politically motivated campaign against Jamaat-e-Islami.

International human rights groups say the tribunal's procedures fall short of international standards, an accusation the government denies.

In a statement the U.S. State Department said further improvements needed to be made in the judicial process in Bangladesh and until then "it is best not to proceed with executions given the irreversibility of a sentence of death."

The European Union, United Nations and human rights groups last week urged Bangladesh not to impose the death penalty.