About 50 lethal knives and swords were handed in during a knife amnesty in Peterborough last month.
Amnesty bins were at Thorpe Wood Police Station, Bridge Street Police Station and Bayard Place, in Broadway, throughout October.
It was in response to an increase in robberies involving a knife in Peterborough.
Detective Inspector Tim Nasta said the amnesty had been a success.
He said: “This means that 50 knives have been taken off the streets of Peterborough, which is great news.
“The figure for robberies involving a knife in Peterborough is low but rising and this amnesty can only help our efforts to drive it down.
“We will also continue our work in schools to warn of the dangers and repeat the message that it’s just not worth carrying a knife because it could ruin your life.”
All the knives collected (a picture of some is below) will now be donated to the British Ironwork Centre, in Oswestry, which is running a Surrender a Knife, Save a Life campaign.
As part of the campaign, which aims to raise awareness of the devastating impact of knife crime, a 26-foot high knife angel is being created using knives handed in across the country.
Between September 1 last year and September 1 this year, there were 41 robberies in the city involving a knife or bladed instrument. For the same period 2013/14, there were 20.
It is illegal to:
* sell a knife of any kind to anyone under 18 years old.
* carry a knife in public without good reason - unless it’s a knife with a folding blade 3 inches long (7.62 cm) or less, eg a Swiss Army knife
* carry, buy or sell any type of banned knife
* use any knife in a threatening way (even a legal knife, such as a Swiss Army knife)
Lock knives (knives with blades that can be locked when unfolded) are not folding knives, and are illegal to carry in public without good reason.
The maximum penalty for an adult carrying a knife is four years in prison and a fine of £5,000.