The father of the Boston Marathon bombing suspects said he was present at the family house in Cambridge, Mass., when the FBI interviewed his older son in 2011. Anzor Tsarnaev, speaking ... from Makhachkala in Russia's Republic of Dagestan, said Federal Bureau of Investigation agents came to talk to his older son, Tamerlan, as a person of interest." "Yes, I was there. Of course I was there," Mr. Tsarnaev said. "It was in Cambridge. 410 Norfolk Street, Cambridge." He said U.S. authorities visited the house for what he described as "prevention" activities that involved Tamerlan. "They said: We know what sites you are on, we know where you are calling, we know everything about you. Everything," Mr. Tsarnaev recalled. "They said we are checking and watching-that's what they said." The father of the pair said he wasn't nervous that the FBI showed up at his home. "I knew what he was doing, where he was going. I raised my children right," he said of his sons. He said he is sure Tamerlan and his brother Dzhokhar must have been framed for the Boston bombing. "This is all lies. These are my children. I know my children," Mr. Tsarnaev said. He said his own brother, Ruslan, called his sons "losers" in an American television interview Friday because of a family feud. Asked if it was possible Tamerlan encountered Muslim fundamentalists while in Dagestan, he said there was no way. "There aren't even any of those here anymore," Mr. Tsarnaev said.