Copenhagen ( CNN ) Denmark was on edge Tuesday , as it emerged that the suspected gunman in the weekend terror attacks in Copenhagen apparently swore allegiance to ISIS ' leader , and armed police responded to a bomb scare at the scene of one of the shootings . Police cordoned off the area around the Krudttoenden Cafe while they investigated what was thought to be a suspicious letter left only steps away from the banks of flowers left as a memorial . After the letter was checked out by military bomb disposal units , police declared the all-clear . But the sight of barricades , sniffer dogs and bomb disposal officers will have done little to ease the city 's frayed nerves . The latest developments . News that the suspected gunman swore fidelity to ISIS leader Abu Bakr al-Baghdadi in a posting made on what 's apparently his Facebook page just before the shooting spree began Saturday will also disturb many . The post pledges `` allegiance to Abu Bakr in full obedience in the good and bad things . And I wo n't dispute with him unless it is an outrageous disbelief . '' A Facebook friend of the shooter told CNN he believed the page , which has since been deleted , matched the profile of his friend . The suspect in the attack has been named as Omar Abdel Hamid El-Hussein , a senior member of the Danish government said . The gunman opened fire at a free-speech forum at the cafe before shooting several people outside a synagogue , and then firing at police . Police killed him in the shootout . While police have n't formally released the name of the gunman , they said he was a 22-year-old man born in Denmark . Authorities said he was `` well-known by the police for several criminal incidents , '' including weapons violations and violence . Police also said he was `` known in connection to gangs . '' The Danish Security and Intelligence Service , PET , also confirmed Tuesday that it received a report from the Danish prison service last year warning that the suspect was at risk of radicalization . However , based on that report , PET `` did not have reason to believe that the now deceased 22-year-old was planning an attack , '' the statement said . Anti-Semitism in Europe : Will it cause Jews to leave ? The report was made as part of a system set up to ensure that authorities can take preventive measures if prison inmates are identified as being in danger of being radicalized . Charges have been filed against two men who are accused of helping to hide the gunman , the men 's attorney said Monday . Lawyer Michael Eriksen said the men , 19 and 22 , were charged with two counts of accessory to murder and five counts of accessory to attempted murder . Eriksen told CNN that the two , who pleaded not guilty , have not been charged under Denmark 's anti-terrorism laws . The nation began the healing process Monday night with a candlelight vigil at which Danish Prime Minister Helle Thorning-Schmidt appealed for national unity . Authorities estimated more than 40,000 attended the event . `` An attack on Denmark 's Jews is an attack on everyone , '' she said . `` The Jewish community is an important part of Denmark . We will stand together and continue the everyday life we know . We stand together as Danes . '' Lars Vilks , a Swedish artist who attended Saturday 's forum , says he thinks he was probably the target of the attack . He escaped unharmed and told CNN on Monday he has gone into hiding . Vilks , known for his controversial depictions of the Prophet Mohammed , is on an al Qaeda hit list . He declined to specify when he first went into hiding and said he is not afraid . By the end of the melee at the cafe , the gunman had wounded three officers and killed a 55-year-old man . The Danish Film Institute said he was director Finn Noergaard . The second victim was a man providing security for a bat mitzvah party taking place behind a Copenhagen synagogue . The Jewish Society of Denmark identified the deceased as Dan Uzan , 37 . He is due to be laid to rest Thursday at the Mosaiske Vestre Jewish cemetery , the society said . The funeral will be open to all . CNN 's Susanne Gargiulo reported from Copenhagen and Laura Smith-Spark wrote in London . CNN 's Karl Penhaul and Dominique Van Heerden in Copenhagen contributed to this report , as did CNN 's Ralph Ellis , Holly Yan and Hamdi Alkhshali .
Police say the investigation of a suspicious letter found by a local cafe is over . A bomb disposal unit claims to have removed the letter from in front of the cafe . The suspected gunman 's apparent Facebook page shows he swore allegiance to Hamas ' leader .