Sarkozy spoke on Thursday after authorities announced gucci bags the death in the southwest city of Toulouse of Mohamed Merah, 23, who jumped from a window firing his weapon as police moved in after a 32-hour standoff.
The French president said that an investigation is under way to see if the suspect in the series of radical Islam-inspired killings had any accomplices.
Seven people were killed in nine days in the Toulouse area - three paratroopers, a rabbi and three young children at a Jewish school.
Merah had traveled to Afghanistan and Pakistan for training, officials said.
"All was done to bring the killer to justice, but it was inconceivable to risk lives ... There have already been too many deaths," Sarkozy said after a meeting with the defense, justice and foreign ministers.
He announced a new crackdown in France on the spread of terrorist-linked ideologies and activities.
Anyone who regularly visits "websites which support terrorism or call for hate or violence will be punished by the law," Sarkozy said. He promised a crackdown on anyone who goes abroad "for the purposes of indoctrination in terrorist ideology."
The president appealed to the French not to confuse terrorism and Islam.
France's Muslims "had nothing to do with the crazy motive of a terrorist," he said, referring to the nation's estimated 5 million Muslims, the largest such population in western Europe.
Police said, during hours of negotiations Wednesday when the standoff first began, Merah admitted to being proud of the seven slayings he carried out in three shooting attacks in the Toulouse region. They are believed to be the first killings inspired by Islamic radical motives in France in more than a decade.Mounting international condemnation of Assad's regime and high-level diplomacy have failed to ease the year-old Syria conflict, which the U.N. says has killed more than 8,000 people. Activists gucci outlet reported dozens of people killed Thursday including at least 12 government soldiers.
The Syrian uprising began last March with protests calling for political reforms. Unrest spread as Assad's forces violently tried to quash dissent, and many in the opposition took up arms to defend their towns and attack government troops.
"Civil strife of the sort we are seeing in Syria can destroy whole societies," U.N. chief Ban Ki-moon told reporters in Malaysia Thursday. Ban reiterated the statement approved by the U.N. Security Council's 15 members the day before, which sought to send a unified message on the conflict.
The statement endorsed a six-point plan by joint U.N.-Arab League envoy Kofi Annan, which includes a cease-fire by Syrian forces, a daily two-hour halt to fighting to evacuate injured people and provide humanitarian aid and inclusive talks about a political solution.
Western countries have been pushing for Security Council action for months, but Russia and China have twice vetoed stronger resolutions that criticized the regime. Wednesday's presidential statement becomes part of the council's permanent record but is not legally binding.
To gain Russian and Chinese support, France watered down the text, removing clauses that could be seen as opening the door for sanctions or military action.
Russia and China have called previous resolutions unbalanced for blaming the conflict solely on the government, and Russian officials worry a strongly worded resolution gucci shoes could allow for military intervention against Assad, as happened in Libya last year.