Two children have been caught taking knives into Lincolnshire schools in the past month, police have revealed.
Luke Walmsley was fatally stabbed at school
Police said while there had been a fall in the number of knife incidents in the county's schools so far this year, they were still concerned.
Officers have arrested a boy and girl, both aged 12, at schools in Louth and Spilsby and confiscated knives.
In November 2003 Luke Walmsley, 14, was stabbed to death at Birkbeck College in North Somercotes.
Lincolnshire police said both pupils in the two recent cases were released on bail after questioning.
The two knives seized both had eight-inch blades.
Ch Insp Jon Morris of Lincolnshire police said: "The problem isn't going away and we want to raise awareness that it is still there following these two recent incidents at schools."
There have been four reported knife incidents at schools in the county so far this year, compared to eight in 2004.
Luke Walmsley's parents, Jayne and Paul Walmsley, have campaigned to improve security in schools to prevent any further tragedy occurring.
On hearing of the latest incidents Mrs Walmsley said: "It is desperately disappointing to hear that, in spite of our son's death, children are still taking knives into schools.
"We don't want Luke to have died for nothing and would ask every single pupil to spare a thought for him and think again before taking a potentially dangerous weapon into school."
A Lincolnshire Local Education Authority spokesman said: "Bullying is an issue that is high on the government's agenda, with the announcement this week to bring in stronger measures to tackle the problem.
"Clearly where bullying is an issue this needs to be addressed and we would strongly urge any young person who is experiencing problems to seek help from their school's teaching staff.
"They should not, under any circumstances, try and deal with it on their own."