Detroit police, fire and the bomb squad surrounded areas around Ford Field and Comerica Park Friday morning after a bomb-sniffing dog sounded the alarm about something suspicious.

However, investigators told Local 4 that suspicious hit turned out to be a scent or residue from pyrotechnics that were inside Ford Field for Saturday's Taylor Swift concert.

The area was being swept as a precautionary measure before the country stars performance.

Areas of Brush Street between Madison and I-75 had been blocked off for the investigation.