Armed police have begun patrolling areas of Sheffield city centre following the Manchester terror attack on Monday evening.
South Yorkshire Police have previously warned residents that they will see an increased presence of both armed and unarmed officers in crowded places.
Armed officers have now begun patrolling areas of Sheffield city centre, including Sheffield train station, Fargate and Barkers Pool.
Police have stressed that the armed officers are not responding to any specific incident and the move was part of their increased presence.
Deputy Chief Constable Mark Roberts said: "You’ll now see an increased police presence of both armed and unarmed officers in crowded places.
"This increase in policing is not based on a specific threat to South Yorkshire, simply our intention to offer reassurance and allow you to go about your business knowing that we stand with you.
"Attacks on our communities, particularly our children, are beyond comprehension. Our resolve to tackle this will bring out our true strength and unity as we stand shoulder to shoulder."
Civil Nuclear Officers have also been drafted in to work with officers across the city to "provide reassurance and help keep our communities safe".
Dedicated police resources have also been deployed across motorways in South Yorkshire, including the M1 and M18.
The move comes after Theresa May increased the UK's terror threat level to critical; only the third time the country has been at the the highest level since its inception.
The new threat level, increased from severe, means that a further attack may be imminent.