Two Christchurch schools were "locked down" after a man was shot nearby today.

In a release to media, police said officers were called to a Hei Hei address about 3pm following reports a man suffered a gunshot wound to the leg.

"A man left the address on foot and two nearby schools, St Bernadette's School and Hornby High School, have been placed into lock down as a precaution.

"Police believe all parties are known to each other and that this was an isolated incident."

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There was no reason for the public to be concerned for their safety, but police were seeking a man who left the address.

He was described as Maori or Pacific Islander, in his 20s and as wearing a red and blue checked shirt and jeans.

"The public are advised not to approach this man but to call 111 if they see a man matching this description. Anyone with any information into this man's whereabouts is asked to also come forward."

A St John spokesman said one man was transported to Christchurch Hospital with serious injuries from the incident.

Hei Hei is a suburb in the west of the city. There is a number of primary and secondary schools in and bordering the suburb.