A woman has been arrested on suspicion of making threats to kill after a school was placed in lockdown.
Pupils at Golborne High in Wigan were forced to hide under desks after a 'gun' threat was made over the internet.
Worried relatives rushed to the gates after armed police were called to the school on Monday.
Classes were halted at 10.40am after online threats from someone claiming to have a gun and targeting the school.
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Police later said the incident was a hoax.
On Tuesday afternoon a 26-year-old woman was arrested in Levenshulme, south Manchester, on suspicion of making threats to kill.
She remains in custody for questioning.
Speaking on Monday Chief Insp Liz Sanderson, of GMPs Wigan Division, said: "Armed officers have been deployed to the scene and the school has been locked down as a precaution.
"The threats were made over the internet and no-one has approached the area with a firearm.
"I'd like to reassure the public that officers will remain at the scene while we investigate."
