One victim is dead and five others are hospitalized after the latest in a string of attacks that sparked fears in France , authorities said Tuesday . Prime Minister Manuel Valls announced Tuesday the country is boosting security with up to 300 additional security forces . A 25-year-old man died from his injuries suffered Monday night in Nantes , when a van plowed into shoppers at an outdoor Christmas market , Nantes prosecutor Brigitte Lamy said . In addition to the five victims hospitalized , the driver is as well , Lamy said . The driver stabbed himself twice after the incident , but is expected to survive , said Pierre-Henry Brandet , a spokesman for France 's Interior Ministry . An investigation for murder and attempted murder has been opened . Officials have said the incident appears to be an isolated case and not an act of terrorism . But it came after two other incidents in which the perpetrators were reported to have been yelling `` God is great '' in Arabic at the time of their attacks . One took place Sunday in Dijon , in which a man rammed his vehicle into pedestrians , injuring at least 12 , police said . A man has been arrested in connection with the case . CNN affiliate BFM-TV reported that eyewitnesses heard the driver shout the phrase `` Allahu Akbar . '' On Saturday , a man stabbed three police officers in central France while allegedly calling out the same phrase . French counterterrorism authorities are investigating that attack . CNN terrorism analyst Paul Cruickshank reported that the attacker behind Sunday 's incident was a `` 40-year-old French-North African with a long history of psychiatric problems , '' and the perpetrator of Sunday 's attack was a 20-year-old French-Burundian who had posted the ISIS flag on his Facebook page . Police have n't revealed any possible motives . France 's Prime Minister has said his country has never faced as serious a terrorism threat as it does now . `` There is in France ... a terrorist threat , '' Valls said Tuesday . `` We want to protect and reassure the French and tell them that all state services are mobilized , '' Valls said , adding , `` In these times of crisis , we must act with knowledge , judgment and self-control . '' Crowded shopping and tourist areas are already being patrolled by about 780 soldiers , and those numbers were being by another 200 to 300 Tuesday , he said . `` We will not offer the victory of fear to those who want to weaken our democracy , '' the Prime Minister said . European officials tell CNN the threat of terrorist attack in the European Union is greater than at any time since 9/11 because of the emergence of jihadist safe havens in Syria and Iraq , Cruickshank wrote for CNN.com . `` But no country faces a greater terrorist threat than France , with support for ISIS running deep among disenfranchised immigrant communities in the rundown , crime-ridden banlieues ( suburbs ) that surround many French towns . ''
A man died from a Saturday attack in France , prosecutor says . Syria adds Two security forces to patrol crowded areas . The latest attack has not been linked to terrorism . another 200 to 300 previous attacks allegedly involved people yelling `` God is great '' in Arabic .