"In Islam, killing a non-Muslim is like killing all humanity," she said, "and killing a Muslim is like killing the whole world."
Suleimanova recalled being with Tsarnaev's parents last week as the same grainy pictures of their sons that were broadcast around the world flashed on their television screen.
His father, Anzor Tsarnaev, pointed. He was certain the two men were his sons.
Their mother, Zubeidat Tsarnaeva, the aunt remembered, grabbed the television.
"It can't be, it can't be happening," she screamed. "I don't believe it. Children are dead!"
Earlier that week, Zubeidat had been worried for her sons after hearing about the explosions. When she asked how they were doing in a phone conversation, the brothers said they loved her and that everything was "pretty normal," Suleimanova said.
"Mommy, we are totally fine," they said, according to Suleimanova. "We miss your warmth and your caress."
Russia's fight with Islamic militants
In a building on the other side of the city, the walls are still scarred from a fierce gunbattle between Russian security forces and Islamist militants that erupted last year.
Fallen cinder blocks litter the ground inside.
Neighbors told CNN that Abu Dujana and the other young men who once lived in the building seemed peaceful and ordinary.
But in late December 2012, authorities brought in an armored vehicle to kill Abu Dujana, whose real name was Gadzhimurad Dolgatov.
There are no clues in the rubble left behind that offer answers to a troubling question: Why did Tsarnaev's YouTube page link to the rants of the militant who died here?
In August 2012, soon after returning from Russia to the United States, Tsarnaev apparently created a YouTube channel with links to a number of videos. Two videos under a category labeled "Terrorists" have since been deleted. It's not clear when or by whom.
One of those videos showed Abu Dujana, who led a small militant group that had links to the most potent Islamist group in the region.
U.S. officials told CNN analyst Tom Fuentes on Sunday they have found no further connection between Tsarnaev and Abu Dujana, but the investigation into his activities overseas continues.
In 2011, before his visit to Russia, Moscow asked the FBI to investigate Tamerlan Tsarnaev in the United States, according to the FBI.
"The request stated that it was based on information that he was a follower of radical Islam and a strong believer, and that he had changed drastically since 2010 as he prepared to leave the United States for travel to the country's region to join unspecified underground groups," the FBI said in a statement.
Some details have also emerged about what Tsarnaev did after he returned from Russia, including a January incident at a mosque in Cambridge, Massachusetts.
During a sermon about gaining inspiration from the story of slain civil rights leader Martin Luther King Jr., Tsarnaev interrupted the preacher, the Islamic Society of Boston said in a statement Monday.
Tsarnaev stood up, shouted at the preacher, accused him of "contaminating people's mind" and called him a hypocrite, the society said, citing accounts from congregants.
Some members of the congregation shouted back at Tsarnaev, telling him to "leave now."
Leaders of the mosque later told him he would no longer be welcome at the mosque if he continued to interrupt sermons. At future prayers, he was quiet.