The United States has agreed to speed up its sharing of military intelligence with France to try to avert such assaults, the US leader added in a news conference after a summit in Turkey.
"There were no specific mentions of this particular attack," Obama said following a gathering of leaders of the Group of 20 top world economies in the Mediterranean resort of Antalya.
The United States is working closely with France in its investigation of the attack and its hunt for suspects in the "heinous" attacks, he said.
The agreement would allow US personnel to pass threat information including on Islamic State jihadists to France "even more quickly and more often" Obama added.
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"We need to be doing everything we can to protect against more attacks and protect our citizens."
Obama also hailed "modest progress" in diplomatic efforts to find a solution to the Syria conflict, after high-level talks between world powers including Russia in Vienna.
"We have begun to see some modest progress on the diplomatic front, which is critical," Obama told reporters.
The Vienna talks have seen the world powers find common ground on the need for a ceasefire in Syria, UN-brokered peace talks and a political transition.
"These are obviously ambitious goals. Hopes for diplomacy in Syria have been dashed before," cautioned Obama.
"There are any number of ways in which this latest diplomatic push could falter," he added.
Obama, who held an informal coffee-table summit with Russian President Vladimir Putin yesterday, said there were still differences between the two leaders over the future of President Bashar al-Assad "who we do not believe has a role in Syria's future because of his brutal rule."