Uldis Nulle, a scientist at the Latvian Environment, Geology and Meteorology Center, said there was smoke coming out of the crater when he arrived at the crash site late Sunday in the Mazsalaca region near the Estonian border.
"My first impression is that, yes, it was a meteorite," he said. "All the evidence suggests this when compared to pictures of real meteorite craters."
He said the rim of the crater was slightly raised and there was a black-grayish scar at the bottom
-- both signs of a meteorite impact.
Experts outside Latvia said it was unusual for such a large meteorite to hit the Earth. The planet is constantly bombarded with objects from outer space, but most burn up in the atmosphere and never reach the surface.
In 2007, a meteorite crashed near Lake Titicaca in Peru, causing a crater about 40 feet (12 meters) wide and 15 feet (5 meters) deep.
Asta Pellinen-Wannberg, a meteorite expert at the Swedish Institute of Space Research, said she didn't know the details of the Latvian incident, but that a rock would have to be at least 3 feet (1 meter) in diameter to create a hole that size.
Henning Haack, a lecturer at Copenhagen University's Geological Museum said more information was needed to confirm that the crater was indeed caused by a meteorite. "With all these kind of reports we get, there always is a pretty large margin of error," he said.
In Latvia, Nulle said a group of experts would examine the crater Monday and bring rock samples back to the capital, Riga, for testing.
Nulle rushed to the site after people in the area reported seeing a fiery object falling from the sky.
Inga Vetere of the Fire and Rescue Service said a military unit has tested the site and found that radiation levels are normal. There were no injures.
She said police have cordoned off the area to prevent souvenir hunters from taking away the soil.
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