Bangladesh has hanged head of the banned Jamaat-e-Islami party Motiur Rahman Nizami for war crimes committed during the 1971 war of independence to break away from Pakistan, the country's the law minister said.
Nizami was hanged at Dhaka Central jail at one minute past midnight local time on Wednesday (1801 GMT Tuesday) after the Supreme Court rejected his final plea against a death sentence imposed by a special tribunal for genocide, rape and orchestrating the massacre of top intellectuals during the war.
Thousands of extra police and border guards were deployed in Dhaka and other major cities to tighten security. Previous similar judgments and executions have triggered violence that killed around 200 people, mainly Jamaat activists and police.
Al Jazeera's Tanvir Chowdhury, reporting from Dhaka, said that the party is likely to call a nationwide shutdown following the execution.
"This is the usual act of the party after each execution or death sentence," he said.
"The party itself is very marginalised right now. Most of the members are either behind bars or on the run. Even if they call for protests, it won't be enforced heavily."
Hundreds of people flooded the streets of the capital, Dhaka, to cheer the execution of Nizami who had been in prison since 2010.
"We have waited for this day for a long 45 years," said war veteran Akram Hossain. "Justice has finally been served."
Five opposition politicians, including four Jamaat-e-Islami leaders, have been executed since late 2013 after being convicted by the tribunal.
The party denies that its leaders committed any atrocities. Calling Nizami a 'martyr', it said he was deprived of justice and made a victim of a political vendetta.
Hundreds of people, mostly university students, took out a procession from Dhaka University to celebrate the execution [Mahmud Hossain Opu/Al Jazeera]
The war crimes tribunal set up by Prime Minister Sheikh Hasina in 2010 has sparked violence and drawn criticism from opposition politicians, including leaders of Jamaat-e-Islami, that it is victimising Hasina's political opponents.
According to the Bangladesh government, about three million people were killed and thousands of women were raped during the 1971 war in which some factions, including the Jamaat-e-Islami, opposed the break from what was then called West Pakistan.
The execution comes as the country suffers a surge in violence in which atheist bloggers, academics, religious minorities and foreign aid workers have been killed.
In April alone, five people, including a university teacher, two gay activists and a Hindu, were hacked to death.