Massachusetts investigators have developed what they call "mounting evidence," bolstered by "forensic hits," that point to the possible involvement of both Tamerlan Tsarnaev and his younger brother Dzhokhar in a triple homicide that took place in 2011, law enforcement officials told ABC News.
The officials cautioned that until more definitive DNA testing is complete, it is still too early to consider bringing an indictment against the younger of the two brothers.
Dzhokhar has already admitted his role in the Boston Marathon bombings that killed three and injured 260 more on April 15. Tamerlan was killed in a shootout with police days after the Marathon bombing attack, but Dhzokhar survived and was captured.
Tamerlan was buried in secret, but a source familiar with the case confirmed for ABC News a report by The Boston Globe that said the 26-year-old was buried in Virginia.
In the wake of the Marathon bombings, Middlesex County began to probe a link between the elder Tsarnaev and Brendan Mess, one of the three men killed in the gruesome slaying on Sept. 11, 2011. Officials said Mess and two men were found in a Waltham residence with their throats slit and their bodies covered with marijuana. Tamerlan and Mess were once roommates and did boxing and martial arts training together.
Now law enforcement officials tell ABC News that some crime scene forensic evidence provided a match to the two Tsarnaev brothers. The officials also said records of cell phones used by the Tsarnaevs appear to put them in the area of the murders on that date. Several officials confirmed the new findings but declined to be identified because they are not authorized to comment on the ongoing investigation, news reports said.
Dzhokhar Tsarnaev is being held in the infirmary at Fort Devens federal prison.
