Emergency operators have been plagued with more hoax calls, according to the police.
More than 50 calls were made on Thursday night from two different mobile numbers traced to the Clare Avenue area of Colne.
According to Sgt Kim de Curtis, a young male voice from the second number told the operator “he wasn’t going to stop”.
A month ago, around 400 malicious calls flooded the 999 emergency line across a three-week period but after police visited Colne Primet Academy to talk to pupils, the calls stopped.
The police have urged parents to report their child if their number ends with 1464 or 7791, adding they may find the numbers have been blocked from making any calls.
Sgt Kim de Curtis said: “We appeal to parents to do the right thing and let us know so we can educate them around the dangers of tying up our 999 lines and wasting operators time who are busy and stretched enough.
“If anyone has any information please contact 101 or email me direct on Kimberley.firstname.lastname@example.org or contact Crimestoppers anonymously on 0800 555111.”