If you are outside today, you may likely hear the screech of fighter jets in the skies above Toronto.

Military pilots from the Royal Canadian Air Force and U.S. Air Force will practice response procedures in high-density airspace as part of a North American Aerospace Defense Command (NORAD) exercise, officials say.

NORAD in a Tweets said the U.S. and Canadian fighter jet pilots will practice ‘response procedures in high-density airspace’ on July 30.

They said the fighters will conduct a mock interception of a contracted civilian aircraft over the city’s core.

“These exercises ensure NORAD forces remain ready to respond to aerospace threats 24/7 anywhere in Canada and the United States,” NORAD said in a Tweet yesterday.

“The defence of North America is our top priority.”

NORAD said Toronto residents may see or hear CF-18s, F-16s and a Boeing KC-135 refuelling tanker.

The routine drill, the said, will take place between 11 a.m. and 1 p.m.

“NORAD routinely conducts exercises with a variety of scenarios, including airspace restriction violations, hijackings and responses to unknown aircraft,” they said in a release.

For more than 60 years, NORAD has identified and intercepted potential air threats to North America through the execution of the command’s aerospace warning and aerospace control missions. NORAD also keeps watch over Canadian and U.S. internal waterways and maritime approaches under its maritime warning mission.