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Calgary police say one person is in custody following reports of a potentially armed person that prompted a lockdown at Lord Beaverbrook High School on Thursday.

Everyone is safe and officers have cleared the school, the police service said on Twitter on Thursday afternoon.

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“There is no current threat to the safety of staff or students,” Calgary police said, noting that their efforts had shifted to investigating the events that led up to the lockdown.

Police added that “reports that a weapon was involved are unconfirmed at this time.”

Crystal Arnold left work and rushed to the school when she got a text from her daughter.

“My daughter texted me and told me that there was a lockdown and that it was serious, and that she’s not supposed to be on her phone but that she’s OK,” Arnold said.

“She said the police came in and said that they’re safe but it’s serious and to stay where they are, so they stayed where they were. There was 80 of them in a small room.”

Arnold said she hadn’t heard from her son so she just needed to make sure he was also safe, and to give both her children a hug.

“I just needed to know he was OK,” she said.

When she arrived at the school, she said she encountered lots of police cars and some other parents waiting for their kids.

It was a relatively calm atmosphere as kids lingered around the southeast school. At least seven police cars were on scene and some students were giving statements to the police.

A young man was held in the back of a cruiser.