Police have said they found 'no trace' of a man following reports a knife incident at Chichester Canal on Friday (July 26).
A police helicopter and a firearms unit were called following reports of a man threatening another man with a knife on Friday night.
A spokesman for Sussex Police said: "The National Police Air Service (NPAS) helicopter assisted response and firearms officers following a report of a man threatening another man with a knife in Basin Road, Chichester, about 11.45pm on Friday 26 July.
"An extensive area search was carried out but there was no trace of the suspect. No injuries were reported."