Footage from the Toronto Globe and Mail show a hail of bullets being fired inside the Canadian parliament building
More shots were fired outside a nearby shopping centre and several buildings around
the city are on lockdown.
It is unclear how many gunmen there are but one shooter is believed dead.
The incident came hours after Canada raised its terror threat level following a fatal hit-and-run attack on two soldiers on Monday.
The latest incident began when soldiers guarding the memorial came under fire on Wednesday morning.
"Shots fired at War Memorial at 9:52am today; one person injured," Ottawa Police tweeted.
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| Armed police head towards the Langevin Block on Parliament Hill |
Police have told those in the vicinity to stay away from windows and roofs as they search for additional suspects.
One gunman - said to be carrying a rifle - fired on soldiers guarding Canada's main war memorial and then ran into the parliament.
"The indications are there is more than one gunman. There may be several," Canadian MP Marc Garneau told the BBC, adding he and fellow politicians were evacuated from the area.
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| The shooting began at the Ottawa War Memorial
Senior government member Tony Clement said on Twitter shots were fired near an in-progress cabinet meeting in parliament.
A government official earlier said the raised threat level was in response to an increase in online "general chatter" from radical groups including Islamic State and al-Qaeda.
Ministry spokesman Jean-Christophe de Le Rue said on Tuesday that the increased level "means that intelligence has indicated that an individual or group within Canada or abroad has the intent and capability to commit an act of terrorism".
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On Tuesday a Muslim convert was killed by Quebec police after deliberately hitting two soldiers in his car, killing one and injuring another.
A minister said it was a "terrible act of violence against our country".
Earlier this month, Canada announced plans to join the US-led campaign of air strikes against Islamic State (IS) militants in Iraq.
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