Jane Dougherty, whose sister was killed in the school attack in Newtown, Connecticut, was also present.
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.
Part of the horror is school officials were aware of the potential danger, as remote as it may have seemed, and had practiced emergency drills, including the locking of classroom doors and the like in the event of an attack on the school.
According to witnesses, the attack began when the school bus stopped to let off two children.
"We came here today to ask the Senate to vote, " said Erica Lafferty, daughter of Dawn Hochsprung, the principal of Sandy Hook Elementary School, who died in the attack.
According to the National Center for Education Statistics, between 1995 and 2009, the percentage of students who reported "being afraid of attack or harm at school" declined to 4% from 12%.
"I don't think anybody from this school could be smart enough to attack a big Internet company like Google, " said Zhang Jian, a 22-year-old auto-repair student dressed in a basketball jersey and flip flops.
She has so far run almost entirely on business-school platitudes to avoid exposing herself to attack by the Republican right.
Ben Wheeler was among the 20 first-graders and six adults killed in the Dec. 14 attack at Sandy Hook Elementary School in Newtown.
Wednesday's attack was the most deadly school-shooting in Germany since 2002, when a former school pupil in the eastern city of Erfurt killed 14 teachers, two pupils and a police officer.
Erica Lafferty, daughter of Dawn Hochsprung, the principal of Sandy Hook Elementary School, who died in the Newtown attack, said in an interview that she felt "overwhelming disappointment" with lawmakers and planned to continue her appeals.
After promotion to lead the whole education portfolio he went on to attack Labour's grammar school policy, calling the selective system "as divisive as it is archaic" and telling MPs how 11-plus exam failures - including his brother - suffered for life.
The children had lived a block from the location of the attack, and were being driven to school by their father that morning.
Mr Harvey was fired after admitting the attack at All Saints' Roman Catholic School in Mansfield but was cleared of attempted murder or intending to cause serious harm.
Reportedly, this petite young high school cheerleader lost vision in an eye following one such attack by her brother.
There have been some successes here too: a task force headed by Nord Anglia has played a big role in helping turn round St George's, a London school where the headmaster was killed protecting a pupil from attack.
ECONOMIST: Privatising state education has had mixed results
Habib said that in an attempt to rebuild the school, a contractor constructed a boundary wall before another Taliban attack.
Peter Harvey, who worked at All Saints Roman Catholic School, in Mansfield, admitted grievous bodily harm after the attack in July 2009.
Mr John, a former Norwich School pupil, was among six UK nationals killed after the attack at the In Amenas gas plant, on 16 January.
Habib and the village elders recalled the attack while sitting in the middle of the devastated school, where debris was still scattered across a vast yard.
Also killed in Monday's attack was Krystle Campbell, who graduated from Medford High School in Massachusetts in 2001.
CNN: Boy killed in Boston blast wrote, 'No more hurting people'
There were three elements to this attack: first, Dukakis' refusal to compel pubic school teachers to lead students in the Pledge of Allegiance.
An Ohio judge has ruled that the rape trial of two high school football players will take place in the county where the alleged attack happened.
In the Newtown attack, it took police 20 minutes to arrive at the school after the first calls for help.
Among the 58 people killed in the July 7, 2008, attack were two Indian diplomats and 14 students at a nearby school.
Officers have now released CCTV images of some men they want to speak to in connection with the attack, which happened as the bus was near the Westminster School.
Dan Plesch, director of the Centre for International Studies and Diplomacy at the School of Oriental and African Studies in London, warned against seeing the attack as a turning point.
An 82-year-old woman is in hospital with serious injuries after a "despicable attack" by a man who tried to rob her near a school.
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