Police said enquiries to locate the suspect were underway after the sighting 'in the vicinity of Litten Gardens'.
Chichester High School was placed on lockdown but students have since been allowed to go home.
Follow live updates as we get them here.
Major police incident in Chichester - Live updates
Last updated: Saturday, 29 May, 2021, 16:41
- Police responded to reports of a man seen with a suspected weapon in the vicinity of Litten Gardens
- Chichester High School students have been allowed home after brief lockdown
- Officers have now detained a man in relation to the incident
‘My dad is a hero’
'My dad is a hero' - Chichester man who reported alleged shotgun incident to police reveals all about his ordeal
"My dad thinks he just did what anyone would do but this isn’t true. He is a hero."
Police have detained a person following reports of a man being seen with a 'shotgun' in Chichester today (Friday, May 28).
Update from Sussex Police
“Police officers responded to a report of a man seen with a shotgun in the vicinity of Litten Gardens, Chichester at 2pm on Friday.
“Officers have now detained a man in relation to the incident.
“As the suspect was reported to be near two schools, we worked with them to take precautions to keep pupils and staff safe while we investigated the report. No threats were made and no one was harmed.
“We would like to thank the public for their patience and understanding while we responded to this fast moving incident.”
Potential suspect apprehended
A man has been stopped following reports of a gunman in the city this afternoon (Friday, May 28).
Man stopped by police in Priory Road
Our reporter Joe Stack has witnessed a potential suspect being stopped by police in Priory Road.
He said he saw at least a dozen police officers, six cars and a police dog at the scene.
Update from the high school
Mr Brixey, deputy headteacher
“We have now let students leave the school site. This follows confirmation from Sussex Police that it is safe for children to travel home. The Police advice is that students go straight home.Please do not ring the school so that our phone lines can remain clear.This was not an incident linked to Chichester High School but the wider Chichester area.Thank you for your support. As we know more we will update you as appropriate.”
Police searching for suspect
A man has reportedly been seen with a weapon in Chichester today (Friday, May 28).
A Chichester school has gone into a lockdown following an armed police incident in the city today (Friday, May 28).