Jane Dougherty, whose sister was killed in the school attack in Newtown, Connecticut, was also present.

BBC: Colorado introduces landmark gun laws

Meanwhile, the headmistress of a Belfast school damaged in an arson attack has blamed anti-social elements for starting the fire.

BBC: NEWS | UK | Northern Ireland | Showroom destroyed in blaze

Ms. Lanza's body was discovered in the aftermath of the attack on the school inside the yellow Colonial-style home she had shared with Adam.

WSJ: Portraits of Newtown Victims