Lars Vilks, who has a $100,000 terrorist bounty on his head, went into hiding following February's Copenhagen shooting.
"Our voices must be louder than the sound of bullets," says Ukrainian FEMEN activist Inna Shevchenko.
Danish police arrested a further two suspects after Danish media named the suspected gunman.
A lone gunman suspected of killing two people in two attacks in Denmark's capital is shot dead.
Hours after the first attack, shots were fired at a Cophenhagen synagogue.