Acts 21
26 Then Paul took the men, and the next day, having been purified with them, entered the temple to announce the [g]expiration of the days of purification, at which time an offering should be made for each one of them.

27 Now when the seven days were almost ended, the Jews from Asia, seeing him in the temple, stirred up the whole crowd and laid hands on him, 28 crying out, “Men of Israel, help! This is the man who teaches all men everywhere against the people, the law, and this place; and furthermore he also brought Greeks into the temple and has defiled this holy place.” 29 (For they had [h]previously seen Trophimus the Ephesian with him in the city, whom they supposed that Paul had brought into the temple.)

Well, so much for trying to blend in and keep the peace.
Someone hollers out “this is the man!” Rumors fly, misinformation is everywhere and people get stirred up.