A Canadian soldier standing guard at a war memorial in Ottawa was shot to death Wednesday, and gunfire then erupted inside Parliament, authorities said.
One gunman was killed, and police said they were searching for as many as two others in what Gilles Michaud, assistant commissioner of the Royal Canadian Mounted Police, called a "dynamic, unfolding situation."
The Ottawa police, via its official Twitter account, warned the public to stay away from that area while it investigated.
The Maple Leafs were on lockdown earlier Wednesday at the team's hotel in downtown Ottawa, a team representative confirmed to ESPN.com. A team spokesman said the Maple Leafs were scheduled to leave Ottawa later in the afternoon as their game against the Senators was postponed.
Pittsburgh will play both national anthems before Wednesday night's Flyers-Penguins game, and Anaheim will have a moment of silence before its game against Buffalo.
Players throughout the league used social media to react to the day's events.
Surreal scene outside of our hotel right now. Lot of very brave police officers we should all be very proud of.
— Joffrey Lupul (@JLupul) October 22, 2014
Sickening news from this morning. Thoughts with those downtown and the law men and women working to keep our city safe. #Ottawa
— Bobby Ryan (@b_ryan9) October 22, 2014
Makes me sad what's going on in Ottawa right now. Thoughts and prays to everyone involved. Everybody stay safe
— Erik Karlsson (@ErikKarlsson65) October 22, 2014
Praying everybody in the downtown area including lots of my friends there are staying safe. Thoughts are with you guys.
— Marc Methot (@MarcMethot3) October 22, 2014
Heart felt thanks to all first responders for putting their safety on the line for ours. #OttawaStrong
— Chris Phillips (@CPhillipsFour) October 22, 2014
— Claude Giroux (@28CGiroux) October 22, 2014
Scary news this morning! Thoughts and prayers to everyone involved! Stay safe! #PrayForOttawa
— Mika Zibanejad (@MikaZibanejad) October 22, 2014
Be safe Ottawa! Praying for everyone involved today.
— Mike Fisher (@mikefisher1212) October 22, 2014
Stay safe Ottawa...world is getting worse by the minute...like seriously society needs to figure it out #PrayForOttawa
— Michael Grabner (@grabs40) October 22, 2014
Thoughts and prayers are with everyone involved downtown, especially the family of the fallen soldier.
— Kyle Turris (@kyleturris) October 22, 2014
My thoughts and prayers are with all those affected by the shootings today in Ottawa. Stay strong & be safe.
— Derek Roy (@Roy9ner) October 22, 2014
At a loss for words with what's happening at home. Thoughts and prayers for those involved, everyone be safe. #CANADAstrong #OttawaStrong
— Erik Gudbranson (@Guddy44) October 22, 2014
Tough day seeing the news from the tragedy back in the homeland. Wishing everyone in Ottawa the best throughout this tough time
— Tom Wilson (@tom_wilso) October 22, 2014
Thoughts with all those affected in Ottawa today....Stay safe
— Brian Elliott (@KidElls1) October 22, 2014