Another two men were ordered to hang for the separate torture and murder of another 13-year-old that occurred less than a month later, the prosecutor said.
In the first case, the Metropolitan Sessions Court in the northeastern city of Sylhet found ten people guilty of lynching Samiul Alam Rajon, a verdict that sparked cheers from hundreds of people gathered outside the courtroom.
"We're happy with the judgement. Samiul's parents are satisfied. I am sure the verdict will send a powerful message to all those child beaters and molesters," said Shahidul Islam, a lawyer representing his family.
13 charged with murder over Bangladesh boy's killing
Samiul, accused of stealing a bicycle, was tied to a pole on July 8 and then subjected to a brutal assault in which he pleaded for his life. An autopsy found 64 separate injuries had been inflicted on the teenager.
A 28-minute video of the lynching, which was widely circulated after being posted on social media, prompted deep soul-searching among Bangladeshis as well as street protests calling for the attackers to be hanged.
The lawyer told AFP that the main accused, Kamrul Islam, was sentenced to death. Three of his friends were given the same sentence, one of them in absentia after going on the run.
Another six accused were given jail sentences ranging from life through to one year, he said.
Kamrul Islam also fled, to Saudi Arabia, a day after the attack, but he was later arrested and extradited after outraged members of the country's large Bangladeshi expatriate community tipped off police.
Protests in Bangladesh over latest child killing
In the second case in the southwestern city of Khulna, a mechanic and his assistant were sentenced to death on Sunday for torturing a 13-year-old former employee to death with an air compressor.
Police said the employer, Mohammad Sharif, became enraged after Rakib left his workshop for another job, and during the attack he inserted the compressor tube into his rectum.
"The Metropolitan Sessions Court sentenced Sharif and his assistant Mohammad Mintu to death for the murder of Rakib," prosecutor Sultana Rahman told AFP.
That case also sparked protests.
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