Images started appearing on social media as the situation unfolded.
Parliament Hill / National War Memorial
Shooting at the war memorial in Ottawa. pic.twitter.com/1Z0p4Mj5Vw
— John Ivison (@IvisonJ) October 22, 2014
#BREAKING Here is a photo from our office window of situation at war memorial. #cdnpoli pic.twitter.com/dDg01S7SBi
— Shirlee Engel (@ShirleeEngel) October 22, 2014
HAPPENING NOW: One person injured in a shooting near Parliament Hill http://t.co/3QsKx6TryK pic.twitter.com/PPgn3DDmlp
— NEWSTALK1010 (@newstalk1010) October 22, 2014
Shot from inside caucus room after shooting @ctvottawa #ottawashooting. pic.twitter.com/JjEWpnbUW7
— Graham Richardson (@grahamctv) October 22, 2014
A body outside ground at library of parliament pic.twitter.com/gtxWamyWmQ
— Josh Wingrove (@josh_wingrove) October 22, 2014
This was the scene earlier pic.twitter.com/LPsi9iLzjN
— Josh Wingrove (@josh_wingrove) October 22, 2014
— Josh Wingrove (@josh_wingrove) October 22, 2014
Police now searching all rooms that weren't locked pic.twitter.com/YAVgZFau5Q
— Josh Wingrove (@josh_wingrove) October 22, 2014
Shots have been fired on Parliament Hill & the War Memorial. RCMP and SWAT teams are on the ground. pic.twitter.com/rtaChN6YYU
— Russ Hiebert (@HiebertRuss) October 22, 2014
Officers say this brown car is suspect's car. Two men were reportedly inside. Suspect ran towards Parliament Hill. pic.twitter.com/No4x7v0lA5
— Jamie Long (@cbcjlong) October 22, 2014
RCMP yelling everyone to back away from Parliament Hill. Weapons out. Word of shooting inside. #cdnpoli pic.twitter.com/aiXtvjlLP6
— Richard Madan (@RichardMadan) October 22, 2014
Canine unit running to Parliament Hill pic.twitter.com/jaEeh0JIpc
— Shirlee Engel (@ShirleeEngel) October 22, 2014
Downtown Ottawa
These are police cars blocking Metcalfe St. In Ottawa. pic.twitter.com/WxSvHgArN0
— Michele Austin (@MicheleOttawa) October 22, 2014
Extended Video: Guns raised, officers rush towards @RideauCentre http://t.co/YHpG2o8XeH pic.twitter.com/UsPYjU85AS
— CTV Ottawa (@ctvottawa) October 22, 2014
View of Rideau Centre from my office in #Ottawa. pic.twitter.com/wZMKZujJD0
— John MacDonell (@JohnMacDonell) October 22, 2014
Police leaving Rideau Centre. pic.twitter.com/OadgHH0DYK
— Jon Willing (@JonathanWilling) October 22, 2014
Une dizaine de policiers toujours devant le Château Laurier #ottawashooting #Ottawa pic.twitter.com/ehvoozoJsV
— Alexandre Poirier (@poirieralex) October 22, 2014
Press Corp across the street from the Chateau Laurier #Ottawalockdown pic.twitter.com/gs1rNLlwNl
— Joe Bowen (@BonsieTweets) October 22, 2014
RCMP has asked Chateau Laurier guests to stay away from windows. Building on lockdown. pic.twitter.com/7eh55pbWvL
— Allya Davidson (@allyaDavidson) October 22, 2014
To all in Ottawa, stay safe & strong. Thank God for Sgt at Arms Kevin Vickers & our Cdn security forces. True heroes #cndpoli
— Peter MacKay (@MinPeterMacKay) October 22, 2014