This is unlikely to have been a random thing. The subject matter and the presence of Lars Vilks, who has a Sharia blasphemy death sentence on his head for drawing cartoons of Muhammad, make this likely to have been more freelance Sharia enforcement.

“Shooting at Copenhagen blasphemy seminar,”BBC, February 14, 2015 (thanks to Anne Crockett):

Danish police have said three officers were shot and wounded at blasphemy debate in Copenhagen where the French ambassador was speaking.

Two gunmen are said to still be at large.

Reports say up to forty shots were fired outside the venue in the Danish capital.

Controversial Danish cartoonist Lars Vilks, who has drawn caricatures of the Prophet Muhammad, was also present at the debate, according to local reports.