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TORONTO — Canada’s threat assessment agency warned last year of the potential for a terrorist attack in Ottawa, calling the capital region “a rich environment” and noting that “active shooter” terror attacks had taken place in the United States and Europe.

In a “Confidential” report, the Integrated Terrorism Assessment Centre also said Canadian Forces could be targeted in Ottawa, adding the Toronto 18 terrorist group had discussed attacking Canadian military facilities and the Parliament Buildings.

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“The presence of numerous high-profile federal institutions, foreign embassies, military facilities, tourist attractions, and special events make the NCR [National Capital Region] a rich environment for possible plots by a variety of differently-motivated terrorists,” it said.

The de-classified report, written in 2013 and released to the National Post under the Access to Information Act, shows that security officials had examined the potential for terrorism in the capital long before last Wednesday’s attack by the gunman who killed Cpl. Nathan Cirillo at the National War Memorial.