Ottawa shooting - level 3
This chilling footage shows the moment Canadian police confront a gunman who shot a soldier at a war memorial in Ottawa.
After shooting the soldier, the gunman ran into the nearby Parliament building where he exchanged gunfire with police.
Security officials can be seen walking through the corridor in the building, looking for the gunman.
A number of shots can then be heard, it's believed that there were up to 30 fired, according to media and eyewitnesses.
Security officials then run in the direction of the gunfire.
Police are now looking for several suspects after a series of shootings in Ottawa that has left one soldier dead.
It has also been reported that a suspected gunman was then shot dead inside the parliament building.
Difficult words: chilling (horrifying, frightening), footage (video), corridor (hallway), eyewitness (person who sees something happen).
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