Police said people reported an “explosion-like sound” as rock fell from the lookout point of the Scarborough Bluffs at around 4 p.m. Sunday.
Video posted on social media shows a large plume of dust as some people look at the cliff, while others can be seen running to shore from the lake and birds can be seen scurrying the opposite way.
Luckily, no one was injured.
Matt Johnston with the Toronto and Region Conservation Authority said it is fortunate that no one was on either end of the cliff when the rocks came crashing down.
“You don’t know what is safe when you are up at the top, and you could be on that piece of rock that slides down,” Johnston told Global News.
“Specific factors that can contribute are a lot of rain and precipitation and it can cause destabilization within the sand mass and the bluffs themselves and wind and rain can trigger it,” he added.
Toronto Fire said firefighters attended the scene but were not needed.
Police are recommending people avoid the area and never venture near any area that has a drop-off.
A warning sign is posted near where the rocks fell that says “Caution falling debris.”