A group of 20 researchers continued to hunt on Sunday for the meteorite believed to have fallen in the fields of St. Thomas in Ontario, Canada.

Scientists at Western University in London, Ontario, on Tuesday said they caught images of a golf ball-sized meteorite blazing through the night sky way into the Earth. They believed it originated from an asteroid belt between Mars and Jupiter.

But Phil McCausland, a meteorite curator at Western, said locating it will be difficult since some of the fragments could be as big as only the size of a human thumb.

"It's going to be difficult to find the needle in the haystack," he said.

Patrick Herrmann, one of the searchers, told CTV Kitchener, said they will continue searching even with the frigid weather.

"I've never found anything in Ontario. I've been in other searches that were successful, but never here," Mr Herrmann said.

"If one of the people finds something, it's exciting for everyone," he added.

In Canada, meteorites become property of the landowner on whose land they were found. Researchers cautioned people to first seek a landowner's permission before searching their private land.

If found, researchers said they are excited over the possibilities of knowledge that will open up.

"It's going to tell us about the things that made the early solar system - what made the earth, what made the other planets," Peter Brown, director of Western's Centre for Planetary Science and Exploration, told Canoe News.

According to CBC, a freshly fallen meteorite isn't shiny and almost looks like black.