Burglars were foiled during a school break-in after the alarm system went off.
Unknown offenders broke into Huncoat Primary School and into the headmaster’s office, but fled after the alarm activated.
Headteacher Sean Crosier said nothing was taken and praised neighbours for the vigilant response.
He said: “When the alarm went off some of our neighbours came out to investigate.
“The burglars broke a panel in the door to gain entry and had a rummage around one of the rooms but didn’t find anything of value.
“They made a bit of a mess and it’s just a pain and a hassle.”
Detective Sergeant Simon Upton, of Blackburn CID, said the school is one of a number targeted across East Lancashire in recent weeks and has appealed for information.
He said: “Nothing was stolen but they have gained entry.
“They got into the headmaster’s office but the security alarm has activated and made them run off.
“We are doing everything we can to try and identify who they are and prevent further incidents happening in the future.
“We are also ensuring our neighbourhood policing teams are speaking to schools to offer further crime prevention advice.”
The incident happened shortly before midnight on Saturday, November 9.
Call Lancashire Police on 101.