BOSTON (AP) — The Boston area held funerals for two more of its dead Friday — including an 8-year-old boy — as more details emerged from U.S. officials and family members about how the two Boston Marathon bombing suspects may have been swayed by a radical, anti-American strain of Islam.

In Washington, Senate Intelligence Committee member Richard Burr, R-N.C., said after his panel was briefed by federal law enforcement officials that there is “no question” that older brother Tamerlan Tsarnaev was “the dominant force” behind the attacks, and that the brothers had apparently been radicalized by material on the Internet rather than by contact with militant groups overseas.