A college in Eastleigh was put into lockdown after police received reports of a person carrying a knife.
Barton Peveril College locked students in classrooms while police searched the site.
Officers said they were called out earlier this afternoon after a person was seen with a knife inside the grounds.
No injuries have been reported and the weapon has not been found.
Officers remain at the scene in Chestnut Avenue, though students have been released and lessons have resumed.
In a statement, a police spokesperson said: "We were called at 2.20pm today, 9 March, to Barton Peveril College in Eastleigh after reports of a person with a knife inside the grounds.
"Officers attended and worked with staff at the school, at this time no injuries have been reported and no weapon has been located.
"We are investigating to establish the exact circumstances of the report. If anyone has any information we ask that they phone 101 with reference 44230095510."
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