Paris ( CNN ) -- French police traded gunfire Saturday in a Strasbourg apartment building with the top suspect in a September supermarket bombing , leaving the 33-year-old man dead and one police officer wounded , prosecutors said . The incident was part of a far-reaching , coordinated counterterrorism operation targeting radical Islamists that led to 10 arrests , Paris prosecutor Francois Molins told reporters . A chief focus of Saturday 's sweep was Jeremy Sidney , a 33-year-old former convict who at one point `` converted to radical Islam , '' Molins said . The prosecutor said Sidney 's DNA was found on a small explosive device thrown September 19 into a kosher supermarket in Sarcelles , outside Paris , wounding one customer . Police officers went Saturday morning to an apartment building in Strasbourg , in eastern France , that was home to one of Sidney 's two `` religious wives , '' said Molins . According to preliminary reports , Sidney shot at police as soon as they opened the door -- firing six shots and emptying his .357 Magnum revolver before being killed in an exchange of gunfire . A police officer who was shot in the thorax is expected to survive , said Molins . He credits the officers ' bulletproof vests and helmets with preventing more injuries . Inside the man 's apartment , police found a female companion with a 6-year-old child and a 1-month-old infant , according to Strasbourg prosecutor Patrick Poirret . The woman was taken into custody as part of the terrorism case , Poirret said . Child welfare workers took custody of the 6-year-old , but the infant was allowed to remain with the woman because she is breastfeeding , Poirret said . Sidney -- who was born in Melun , France -- was sentenced to two years in prison in 2008 after being convicted of drug trafficking , said Molins . French intelligence operatives had been monitoring him since spring -- well before the Sarcelles ' attack -- but he had not been questioned by authorities . `` He appeared ( to be ) a delinquent converted to radical Islam , '' said Molins , who later added that Sidney never trained to fight abroad . A total of 10 people were arrested Saturday across France , as part of the law enforcement operation . One man who was arrested on top of a building in Torcy , about 25 kilometers ( 16 miles ) east of Paris , was armed with a loaded . 22 caliber pistol , Molins said . Authorities can detain the suspects for 96 hours from Saturday morning , at which time they must press charges or release them . All 10 people are being held on suspicion of having links to terrorism , manufacturing deadly explosives , illegal possession of weapons and attempted homicide of police officers . Three of them have criminal records for drug trafficking , theft or violence , according to Molins . `` They are common criminals who started to be radicalized to become radical Islamists and jihadists , '' he said . Police seized a number of items such as ammunition , a list of `` Israelite '' organizations in and around Paris , a publication produced by al Qaeda in the Arabian Peninsula , wills , computer equipment and 27,000 euros ( $ 35,000 ) in cash , the prosecutor added . Saturday 's operation targeted members of what Molins called an organized terrorist cell . `` We are dealing with a group of a few people who are in constant contact and are supporting each other on a regular basis , '' he said . French Interior Minister Manuel Valls briefed President Francois Hollande on the operation Saturday . Hollande reiterated his country 's determination to protect the French people against all forms of terrorist threats . He praised the action of police and asked Valls to take necessary measures to maintain vigilance , Hollande 's office said . CNN 's Pierre Meilhan and Laura Smith-Spark contributed to this report .
NEW : The suspect ` ` converted to radical Islam , '' like others ' , a prosecutor says . NEW : 10 people nationwide are detained and accused of having terrorist ties , he adds . France : Police seize ammunition and a list of possible targets , a prosecutor says . France 's president hails law enforcement officials for their actions in the attack .