Two Middleton primary schools were put on lockdown after a man made threats involving a nearby medical centre.
St Mary's RC Primary School and Bowlee Community Primary School were secured as a precaution on Tuesday morning.
Greater Manchester Police confirmed threats had been made involving nearby Woodside Medical Centre via a phone call at around 9.10am.
The two schools nearby locked their gates and pulled down their shutters in response to the threats.
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No one was hurt during the incident, police say.
A spokesman for GMP said: "We were called at 9.10am to reports that a man made threats to the Woodsite Medical Centre in Middleton.
"These threats were made over the phone."
Parents of pupils at Bowlee were sent a text message informing them of the situation.
It is understood that schools were told the man could have had a knife.
One relative who contacted Bowlee said: "I spoke to the headteacher and they said they'd received a call from St Mary's saying a man was running around Lakeland Court with a knife and as a precaution St Mary's had been shut.
"They said Bowlee had done the same and that the kids were safe, and working inside unaware of what was happening."
A member of staff at Bowlee Community Primary confirmed that the school had followed lockdown procedure as a precaution.
They said the shutters have since been lifted.
The Manchester Evening News has contacted St Mary's RC Primary School for a response.
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