From The Toronto Star:

Five cameras recorded the slow fireball which may have dropped meteorites – weighing up to a few hundred grams – in a region between Newmarket and Lake Simcoe.
Small meteorites may have been dropped on southern Ontario by a fireball that streaked through the sky north of Toronto last month.
Researchers are anxious to retrieve any possible fragments of what’s believed to have been a meteorite that appeared over Newmarket, at just after 8:30 p.m. March 15.
The Royal Ontario Museum and The University of Western Ontario are now asking residents in the area for their help in finding the space debris.
Five cameras recorded the slow fireball which may have dropped meteorites – weighing up to a few hundred grams – in a region between Newmarket and Lake Simcoe.
The cameras were set up by the physics and astronomy department at Western.
Dr. Kim Tait, who is in charge of meteorite collection at the museum, says the fragments could provide clues to the material in our solar system.
“We’re very excited about this,” Tait said in a release Wednesday.
“Although this is not the first time a meteorite has fallen in Ontario, we are very interested in recovering fragments.”
Residents who discover fragments on their property are asked to contact the museum’s mineralogy department.
The fragments are not dangerous to handle and often are black due to a fusion crust, a thin black rind that is sometimes shiny or dull black due to the outer surface being burned during entry into the atmosphere.
They are almost always magnetic, so people who find a suspected fragment could test for this as well.
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Tags: Dr. Kim Tait, Flying Objects, GTA, Meteorite, Newmarket, Ontario, Royal Ontario Museum, Space, Space Exploration, Toronto, University of Western Ontario