A teaching assistant was threatened with an imitation gun by a gang of schoolgirls in Liverpool after telling them off, police have said.
The woman was left traumatised after one of three girls, all aged 14, pulled a BB gun, which fires plastic pellets.
When she asked them to leave the premises of St Ambrose Barlow High School in Netherton, a girl produced the gun and fired it in the air.
The girls were arrested shortly after the incident on Monday afternoon.
They were questioned on suspicion of possessing an imitation firearm and bailed pending further enquiries.
Insp Dave Formby, of Merseyside Police, said: "It is worrying that children have access to BB guns like this.
"It is very hard to tell the difference between BB guns and general guns, and therefore there could be tragic consequences."
Merseyside Police are also investigating an incident in which a 10-year-old boy was shot in the buttock with an airgun in Speke.
A police spokeswoman said a 35-year-old local man was arrested on suspicion of wounding and bailed until December.