Officers responded to reports of a disturbance in the area around Bishop Luffa School and Chichester High School at around 2:30pm yesterday.
Sussex Police have issued the following statement: "Due to the nature of the report, armed officers were deployed to the scene and carried out an extensive search of the area. No weapons were seen and no injuries were reported.
Our enquiries are ongoing at this time, and officers will remain in the area for community reassurance.
In the meantime, anyone with any information or footage of the incident is asked to report it online or call 101, quoting serial 790 of 16/10."