Fire alarm at Starbucks

I was on my way to pickup a friend, and heard what sounded like a fire alarm. Initially I thought it was coming from the newly-built WalMart and thought the system was having a problem. Later saw it was from this drive-thru Starbucks. I got out and started to look for any signs of fire, but saw none. Circled around and saw an outdoor signal sounding saying it was a sprinkler alarm. I called 911 and they said it had been reported. Interesting night, I must say!