Tsarnaev's mother said that FBI agents had told her they feared her son was an "extremist leader", and that he was getting information from "extremist sites". She said Tsarnaev had been under FBI surveillance for at least three years and that "they were controlling every step of him". The FBI flatly denied this accusation. Tsarnaev "vaguely discussed" "jihad" during a 2011 phone call with his mother that was taped by the FSB, and intelligence officials also discovered text messages in which his mother discussed how he was ready to die for Islam. In late 2011, the [[Central Intelligence Agency]] put both Tsarnaev and his mother on its [[Terrorist Identities Datamart Environment]] database. Two Jewish men, Erik Weissman and Raphael Teken, as well as their roommate Brendan Mess, were killed in a triple homicide in [[Waltham, Massachusetts]], on September 11, 2011, the 10-year anniversary of the [[September 11 attacks|9/11 attacks]]. Each victim's throat had been slit with such great force as to be nearly decapitated. Thousands of dollars worth of marijuana and cash were left covering the victims' bodies, and $5,000 was left at the scene. The local district attorney said that it appeared that the killer and the victims knew each other. It was reported on April 23, 2013, that local authorities believed Tsarnaev may have been responsible for the triple homicide, and they and the FBI were investigating the possibility. In May, forensic evidence connected the two brothers to the scene of the killings, and their cell phone records appeared to place them in the area. 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. [[American Broadcasting Company|ABC]] reported on April 23, 2013, that authorities linked Tsarnaev to the Waltham unsolved triple homicide. A search warrant affidavit partially unsealed in November 2019 provided further details to Tsarnaev's link to the triple homicide. Tsarnaev traveled to Russia through [[Moscow]]'s [[Domodedovo International Airport]] in January 2012, and returned to the U.S. in July 2012. He and his wife received [[public assistance]] and [[Supplemental Nutrition Assistance Program|food stamps]] from September 2011 to November 2012, which included all the time Tsarnaev was in Russia. Zubeidat Tsarnaeva said her son had wanted his wife and their child to move to Dagestan with him, and that: "She herself agreed; she said she wanted to study a different culture, language."