MADRID, Sept 8 (Reuters) - Spanish police have arrested a total of eight African immigrants after weekend riots erupted in a southern town following the fatal stabbing of a Senegalese man, officers said on Monday.

Four of the men, two from Senegal and two from Guinea Bissau, were detained on Sunday evening after a renewed outbreak of violence in Roquetas de Mar.

On Saturday a number of Sub-Saharan immigrants vandalised property, burnt rubbish bins and threw stones and bottles at police after the 28-old Senegalese man was killed.

A witness said the man was knifed as he tried to intervene in a dispute between Senegalese and Roma families in the area.

The dispute is believed to have been over an unpaid debt, a police representative told radio station RNE.

Rioters set fire to two homes which they believed belonged to family members of the culprit as well as burning a number of parked cars, the police said.

About a third of the town's residents are immigrants, many of whom work in the agricultural sector. (Reporting by Feliciano Tisera; Writing by Paul Day; Editing by Matthew Jones)

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