Armed police teams have reportedly been spotted in a street close to Sheffield city centre.
A passer-by said: “Four SUVs, including one unmarked, full of armed police in full gear, parked in a line near the back of Decathlon.”
They said the officers were there at about 11am.
The scene was clear when The Star visited a short while ago.
We have asked South Yorkshire Police for details and will bring you updates when we get them.