Police cars, ambulances and fire engines were out in force on The Moor.
But there was no real emergency – it was a fun day in celebration of the National Emergency Services Museum.
Hundreds of visitors visited the city centre to see the dozens of emergency vehicles on show, including some from the RNLI and Air Ambulance.
The National Emergency Services Museum, formerly the fire and police museum, is based at the old police and fire station on West Bar.
Museum director Matt Wakefield said he was pleased with the number of visitors who turned out to see what the museum has to offer.
“It has been a fantastic day,” he said.
“It’s unusual to see something like this in the city centre and it seems people have had a really good time.
“A lot of people wouldn’t have seen what we have to offer until now so it’s a great way of finding more out about the museum.”
Sandra Barley, The Moor’s centre liaison manager, said: “Thank you to everyone who came down and took part in the fun.”