Waterloo Regional Police say officers seized 250 guns, 200,000 rounds of ammunition and a grenade from a home in Kitchener on Halloween.
According to police, the weapons were seized at a home on Strathcona Crescent.
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One man was arrested and charged with unsafe storage in connection with the seizure, police say.
A police spokesperson says officers believe the man was a gun enthusiast or collector.
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Police are still investigating the incident and say that further arrests and charges could be announced.
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