Police descended on Bristol city centre after two men were detained in Greggs.
Witnesses described seeing at least six police cars with flashing blue lights arrive in Broadmead.
A spokesman for Avon and Somerset Police confirmed security guards at the popular bakers detained two men for allegedly shoplifting.
The force spokesman said: "We were called at 4.50pm to Greggs.
"Security guards had detained two men for stealing."
He said it was too early to confirm if any arrests had been made.
A witness told Bristol Live: "There's six police cars and an ambulance car."
A spokesperson for South Western Ambulance Service said paramedics were on scene to help a person suffering from a 'medical incident'.
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