UPDATE 1-Poland mourns victims of Krakow mass shooting as security fears grow

* Six killed after gunman opened fire in city's main square * Saturday's attack shakes Poles' sense of security * Shooting likely inspired by far-right ideology, authorities say (Adds nationalities of

(The article has been published through a syndicated feed. Except for the headline, the content has been published verbatim. Liability lies with original publisher.)