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 Copenhagen cafe is over . The Danish police said they have closed their case and are not looking for anyone else in connection with the letter. The suspected gunman 's apparent Facebook page shows he swore fidelity to ISIS ' leader .
Police say the investigation of a suspicious letter found by a Copenhagen cafe is over . The Danish police said they have closed their case and are not looking for anyone else in connection with the letter. The suspected gunman 's apparent Facebook page shows he swore fidelity to ISIS ' leader .