Yusufi Vali, executive director of the Islamic Society of Boston, which runs the mosque, said 26-year-old Tsarnaev told the speaker, "You are a kafir [an unbeliever]," and said he was contaminating people's minds and was a hypocrite.
Vali said, "The congregation then said, 'You are the hypocrite.' The congregation shouted him out of the mosque."
The holiday named for the civil rights leader who advocated non-violent protest was about three months before the attacks on Marathon last week that killed three people.
It was the second time that Tsarnaev had made an outburst during one of the speaker's sermons, Vali was quoted as saying by the Boston Globe.
"There was nothing about it that would suggest that he would kill a person," Vali told the daily.
Vali said Tsarnaev "was just expressing his opinion about his belief" and it wasn't seen as something that would rise to the level of alerting authorities.
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