African immigrants have rioted in Spain after a Senegalese man was stabbed to death in the street of a southern town. Police said the rampage began in the early hours of Sunday, and led to houses and cars being set on fire. After the 28-year-old man was killed in a fight in Roquetas de Mar, an angry gathering "degenerated into violence and public disorder", a statement said. Police said they did not know what led to the attack, but they were looking for a local man. A witness said the man was killed as he tried to intervene in a dispute between Senegalese and Roma (Gypsy) families in the area, Reuters reported. Rioters set fire to two homes of relatives of the man suspected of the killing, police said. They also said rioters attacked firefighters with stones, and clashed with police. There are a high proportion of immigrants in Roquetas de Mar, in the province of Almeria, many of whom work in the agricultural sector. Source: BBC