Five men are still being sought by police in connection with crowd trouble at a Luton Town football match.
A group of Luton fans invaded the pitch at a Blue Square Premier play-off semi-final second leg on 3 May, pelting coins and missiles at York City fans.
The violence broke out at Luton's Kenilworth Road ground after the club's 2-0 aggregate defeat.
Images of the five were among 20 photos of suspects issued by police last week.
Police and club stewards were also targeted by the troublemakers on the day that Luton's promotion hopes were dashed.
Outside the ground goods from a hardware shop in nearby Dunstable Road were stolen, damaged or used as missiles, Bedfordshire Police said.
Officers arrested seven people on the day of the game.
A spokesman said one was prosecuted and jailed, another was released without charge and a third was still waiting for a decision on whether or not he would be prosecuted.
The remaining four were not connected with the disorder and were dealt with for minor offences, he said.
Inquiries have led to 30 more arrests in the past three months.
The spokesman said 22 files had been sent to the Crown Prosecution Service.
"Since 20 photos of people we want to speak to were released last week, 15 have been tracked down.
"To their credit, some of those sought have handed themselves in at police stations."