Almost 1,500 weapons were handed in during the amnesties
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More than 600 weapons were handed in during Northern Ireland's second knife amnesty.
The knives were handed in at special disposal bins placed in council civic amenity sites.
The three-week amnesty, which began last month and ended on Monday, was introduced as part of a year-long strategy aimed at reducing knife crime.
Assistant Chief Constable Duncan McCausland said police were delighted at the public's response.
The disposal bins are to remain permanently on site at amenity centres across Northern Ireland.
'Robust'
Mr McCausland said the 602 knives collected, added to those handed over during the amnesty earlier this year, meant that almost 1,500 potentially-lethal weapons had been taken off the streets.
He said police would maintain "a robust charging policy against individuals who carry offensive weapons" with officers continuing to use metal detectors across the province.
"I have always said that one knife taken off our streets is a success," he said.
"Since our campaign commenced back in May, police have received a number of calls from members of the public who have concerns and frustrations with retailers who are selling knives, swords and offensive weapons.
"Police will continue to visit shops and market stalls to advise, and if appropriate, prosecute retailers found to be breaking the law."
Mr McCausland also welcomed a proposed change in legislation which would raise the age for purchasing a knife from 16 to 18 years.