Fire crews, police officers and ambulances rushed to the scene after eager children made their way into Sheffield city centre.
Sirens were blazing for all the right reasons as emergency services personnel stepped out to show excited children how they operate on a normal day.
The 999 family fun returned to The Moor for the second time, after the success of the inaugural event last year.
In what looked like the scene of a serious crime incident or major disaster, police in full riot gear spoke to youngsters, fireman in uniform talked about fire prevention and paramedics showed people inside their ambulances.
Fire and police cadets also invited children to have their fingerprints taken and gave them advice in what to do during a fire and how they can stay safe.
Other experiences included a ‘smoke house’ simulation, where children escaped from a smoke-filled room.
Sunday’s event also had demonstrations from South Yorkshire Mountain Rescue, air ambulance staff, HM Coastguard and lifeboat charity RNLI.