Their reports on school violence advise instituting techniques of early detection and threat assessment as the means most likely to succeed in stopping school killings.
His rare pronouncements on the two main national issues of the past few weeks show him failing to use opportunities for straight talking: he was late in criticising Congress's Kosovo votes, and did little to lead public debate about gun laws and youth violence in the wake of the high-school killings in Littleton, Colorado.
The proposals, all recommended by the president in the aftermath of the killings at an elementary school in Connecticut, include expanded background checks, tougher laws against gun trafficking and straw purchases, and improving safety at schools.
CNN: Obama: 'Shame on us' if Newtown doesn't bring new gun laws
It spread to the country's schools in 1994, when President Clinton's Gun-Free Schools Act required them to suspend for a year all students caught bringing guns on to their premises, and has been gathering momentum ever since, particularly after the gruesome killings at Columbine High School in Littleton, Colorado earlier this year.
The announcement came a month after the 14 December killings of 20 children and six adults at a primary school in Connecticut.
The survey by polling company CSA, confirming a recent trend as the incumbent narrowed the gap with Mr. Hollande was carried out after the killings of three children and a teacher at a Jewish school in Toulouse on Monday, but before police surrounded the house of the suspected killer.
Roberts then transferred to another district and graduated in 2008 from Oregon City High School, the school said in a statement on its website that also talked about the killings.
Friday's killings took place in two rooms within a single section of the school, police have said.
Brogan Rafferty, 17, of Stow, Ohio, a high school sophomore, was convicted in October on charges of aggravated murder and attempted murder in connection with the killings, CNN affiliate WJW reported.
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