Cannot remove amber alert notification from notification bar

[victorgrant]

Hi,

I received an amber alert on my Blackberry Priv (Android 6.0.2) over a month ago. Like every other human being who's received one of those for the first time I promptly turned off those notifications, but I still have that one alert showing up in my notification list. I cannot remove it by swiping it to the right, as the other notifications allow. "Clear all" does not work either. Pressing and holding on that notification shows an info icon which shows information about that alert when pressed. Swiping to the left doesn't work either. Any idea how to remove that alert, short of doing a factory reset?

Please help.

I didn't find the right solution from the Internet.

References:
forums.androidcentral.com/ask-question/850440-cannot-remove-amber-alert-notification-notification-bar.html
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