Five people were killed in bow and arrow attacks in Norway yesterday.
Police are to be armed as a result of the events in Kongsberg - around 50 miles outside the capital, Oslo.
A number of others have been injured, though the extent isn't known yet.
One man's been arrested - officers believe he acted alone.
Bray Councillor Caroline Winstanley Elected Cathaoirleach Of Wicklow County Council
Fresh Search Underway In Co Wicklow In Jo Jo Dullard & Deirdre Jacob Investigations
Wicklow Must Overcome Offaly Challenge To Reach Tailteann Final
Wicklow's Simon Harris Plots A United Ireland With Announcement Of Blueprint Plans
Wicklow Stick With Winning Formula Ahead Of Antrim Trip