Denmark on Sunday marked a year since a gunman killed a filmmaker and a Jewish security guard in twin attacks in Copenhagen, honoring the victims under tight security, AFP reports.

Prime Minister Lars Lokke Rasmussen left flowers outside the cultural center and the synagogue targeted on February 14, 2015 by Omar El-Hussein, a 22-year-old Dane of Palestinian origin.

El-Hussein had opened fire with an automatic weapon at the cultural center where Swedish cartoonist Lars Vilks -- reviled by Islamists for portraying the Prophet Mohammed as a dog in 2007 -- was attending a conference on freedom of expression.

Danish filmmaker Finn Norgaard, 55, was killed and three policemen were wounded. After managing to escape, the assailant shot a 37-year-old Jewish security guard, Dan Uzan, in front of a synagogue, also wounding two police officers.

El-Hussein, seemingly inspired by the attacks on French satirical weekly Charlie Hebdo, was killed a few hours later in a shootout with police in Copenhagen's immigrant-heavy Norrebro district.