Very cool service you have setup here, just playing around with it this afternoon.
Setup an alert for the Hillsboro Area (5000 meter radius centered on Hillsboro), ChestPain/Heart Call came in on NW Lincoln St. and I started getting a barrage of text messages from the system all for the same call. After about 20 I went in and deleted the alert from places, after 70 I went into my profile to change my phone number. I'm up over 100 messages now all for the same incident. Maybe I caused a loop because of the size of the area I setup?