WASHINGTON (WUSA) -- Friday morning, a letter containing a suspicious substance was found at the Canadian Embassyat 501 Pennsylvania Avenue NW. The letter was found in the mailroom.

Streets surrounding the embassy were closed and Metro reported that buses were experiencing 15 minute delays in the area.

D.C. police say nothing harmful was found and they gave the all-clear about an hour and 45 minutes after they were called to the building.

Secret Service is investigating.

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