( CNN ) -- Four more arrests have been made in connection over the death of a Dutch volunteer soccer official who was allegedly beaten by teenage players at an amateur game earlier this month . Dutch police said Tuesday they had arrested two 16-year-olds , a 17-year-old and a 50-year-old man . The latter is the father of a player of the Amsterdam junior side Nieuw Sloten that played in the match against SC Buitenboys , for whom 41-year-old Richard Nieuwenhuizen had volunteered to act as linesman for the December 2 game . There are now a total of eight people in custody following the arrest of four teenagers last week , and Dutch police have asked for anyone with photos or video recordings of the attack to come forward . If convicted of charges of manslaughter and assault , the two 15-year-olds in detention would serve a maximum sentence of one year in a youth prison -- while the 16-year-olds could be jailed for up to two years , unless judges rule that they should be treated as adults . Nieuwenhuizen 's son was playing for Buitenboys when the incident occurred in the city of Almere . The linesman reportedly fell into a coma after he was beaten , and he died the next day . Last weekend , 33,000 amateur football games across the Netherlands were canceled in tribute to Nieuwenhuizen , who was buried on Monday . Nieuwenhuizen 's death has resonated across the globe , with FIFA president Sepp Blatter among those extending condolences . `` Football is a mirror of society , and sadly the same ills that afflict society -- in this case violence -- also manifest themselves in our game , '' the head of world soccer said in a statement on FIFA 's website . `` Nevertheless , I remain convinced that football -- through the example set by the tireless efforts of people like Mr. Nieuwenhuizen -- is a force for good , and we must continue to use its positive example to educate people against these wrongs . '' Despite a relatively small population of 17.5 million , Holland has built an outstanding reputation for developing young footballers over the years , with its amateur youth clubs providing a strong breeding ground for the country 's professional clubs .
Three people now in custody over the murder of Dutch volunteer soccer official . Two year - olds , a 17-year - old as well as a 50-year - old were arrested on Sunday . Dutch police appeal for anyone with photos or video recordings of the attack to come forward . Richard Nieuwenhuizen , 41 , died after being beaten following an amateur match .