Call 911 in Canada and the United States. Elsewhere, call your local emergency number (for example 112 in the EU, 999 in the UK, 000 in Australia).
Call or text 988 in Canada or the United States, any time. Use it for yourself or when you are worried about someone else. If there may be immediate danger, call 911 instead. Not being sure is not a reason to wait.
Contact your local police non-emergency line, a school or workplace safety contact, or a mental health professional, and describe what you saw or heard. If you cannot tell whether the danger is immediate, not knowing does not mean it is safe. Call and ask for guidance.
Canary cannot call anyone or notify anyone for you.