iWatch SOS Malfunction

This past Friday morning, 7/21/17, my iWatch sent an emergency alert to my three ICE contacts stating that I had just made a 911 call from my current location. However, I had not made such a call. After confirming with them that I had not actually made such a call, it sent out essentially the same message again. So, once again I had to confirm with them that I had not actually made such a call. It was more than a little disconcerting to my family as I was on travel in NYC at the time and the messages went out pretty early in the morning. Can't seem to find anything that would explain how this message could go out when I didn't make the 911 call. Any explanation available? Or any steps I can take to make sure it doesn't happen again?