Police investigating racist and homophobic chanting at a football match released pictures of 16 suspects on Wednesday.
The appeal by Hampshire Police follows abuse directed at Portsmouth defender Sol Campbell during a game against Tottenham Hotspur on Sunday, September 28.
The images show 16 people caught on camera by a police officer at the match at Fratton Park.
Superintendent Neil Sherrington said: "As part of our investigation into indecent chanting at Fratton Park, we have identified 16 people we would like to speak to.
"Our inquiry is aimed at identifying and putting before the court those individuals who engaged in unacceptable behaviour at this public event.
"Their abuse caused distress to some supporters and was targeted at an individual.
"We want to send a clear message that abuse of this kind will not be tolerated and that we are taking robust action.
"I'd urge anyone who recognises these people to contact us as soon as possible."
The offence of indecent or racist chanting at a designated football match under the Football Offences Act 1991 can be punished by a fine of up to £1,000 and can also lead to a football banning order.
Anyone with information should contact Operation Decorum on 0845 0454545 or Crimestoppers on 0800 555 111.
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