A man has been arrested on suspicion of manslaughter after the death of a football fan following a brawl near a pub.
Tony Johnson, 55, suffered a fatal head injury near The Manchester bar on Blackpool promenade after the Blackpool v Burnley match on 4 March.
Lancashire Police said warrants had been carried out at four houses in Burnley and four in the Blackpool area.
Six other men were arrested on suspicion of violent disorder.
The force said a 33-year-old man from Burnley was being questioned in custody on suspicion of manslaughter.
Two men from Blackpool, aged 28 and 49, an 18-year-old man from Poulton-le-Fylde, two men, aged 18 and 45, from Foulridge, and a 31-year-old were also arrested in the raids.