A young boy has left a handwritten letter thanking police for "saving our lives and keeping us safe" following the stabbings at Manchester's Arndale Centre on Friday.
The note was slipped under the windscreen wiper of a police patrol vehicle in the city centre on Saturday.
Inspector Jon Middleton said the card, written by a boy named Adam, acted as "a great reminder to us of why we do what we do".
On Friday, a knifeman was detained after running amok in the Exchange Court area of the Arndale Centre shopping precinct. The attacker lunged at and stabbed passers-by, reportedly at random, with the weapon before being confronted by two unarmed police community support officers (PCSOs).
Dear Adam-Hopefully someone will show this to you (you're prob too young to be on twitter!) I'd like to say huge thanks from @GMPCityCentre @gmpolice for your lovely card & kind words-it brought a happy tear to my eye💓 & is a great reminder to us of why we do what we do Insp M pic.twitter.com/ASRWWe53pH— GMP City Centre (@GMPCityCentre) October 14, 2019
The little boy wrote: "Thank you for saving our lives and keeping us safe.
"I like the police the police because when I wave at them they always wave back."
The letter also included a drawing of an officer with a police car and a list of equipment they carry, including pepper spray, a radio and even a Taser.
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The message was shared by the GMP City Centre team on Facebook and Twitter in an attempt to find Adam's parents and invite him to meet the officers.
The force has urged the boy to get in touch so he can visit the station.
Writing on Twitter, Inspector Middleton said: "We would love to meet you and you could sit in a police car and try on some of the equipment, although I'm afraid we can't let you play with a Taser."
A 19-year-old woman, a 59-year-old man and another woman were injured during the stabbing at the shopping complex on Friday.
Two others were hurt, but none of the injuries are thought to be life-threatening.
The suspect struck just a short walk away from Manchester Arena, where 22 people died in a suicide bombing at an Ariana Grande concert two years ago.
Greater Manchester Police Assistant Chief Constable Russ Jackson said the attack brought back memories of the "awful events of 2017."