Some pupils have reportedly been taken out of school by their parents
A number of schools have sent out emails to parents informing them that a lockdown has been put in place.
West Yorkshire Police said: "Police are aware of an email which has been sent to a number of schools in West Yorkshire today. This is being investigated by police and officers are providing reassurance and safety advice to affected schools."
South Africa Latest News, South Africa Headlines
Similar News:You can also read news stories similar to this one that we have collected from other news sources.
'Malicious and threatening' email sent to 'large number' of Manchester schoolsThreatening emails have been sent to a 'large number' of schools in Greater Manchester and Cheshire.
Read more »
DUP pressurised by small number of hardliners to stay out of StormontThe Northern Ireland minister urged those hardliners to consider what sort of future they want for the region.
Read more »
DUP pressurised by small number of hardliners to stay out of StormontThe Northern Ireland minister urged those hardliners to consider what sort of future they want for the region.
Read more »
Small number of 'unelected figures' driving DUP Stormont boycott, Baker saysSteve Baker questions influence of 'unelected figures' on party
Read more »