How to Stop a Car Alarm?

A previous frustration articulated nicely

“Dear PoPville,

Checking to see if anyone knows what can be done to stop a car alarm which keeps going off down the street from my house on 10th St in Shaw. It will beep for about ten min, stop for about a min and then start again. This has been going on for about an hour. Wondering if anyone has suggestions (anyone to call?) otherwise it’s going to be a long night!!”

Ed. Note: Previously folks have had success calling 311.