The NRP has confirmed that an arrest has been made in the investigation.
Officers confirm that they will be leaving the area shortly, and residents will soon be able to return home.
Police say more details will be released after detectives have been able to investigate.
Police are on the scene at a St. Catharines residence after receiving reports of an armed person.
Around 11:50 this morning, St. Catharines uniform officers were called to a residence near Queenston Street and Lorne Street.
Members of the Emergency Task Unit, Crisis Negotiators and the K-9 unit are on the scene, and the house has been contained.
Police are asking the public to avoid the area.
This is a developing story, and more details will be provided when they are made available.
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