African migrant labourers have gone on strike in Italy in protest at their poor working conditions, after 16 workers died in road crashes.

Shouting “we are not slaves”, farm workers downed tools and marched on the city of Foggia in southern Italy.

Thousands of migrant labourers come to Italy in the summer, earning as little as one euro (£0.90; $1.15) for picking 100kg (221lb) of tomatoes.

Unions have previously argued for a public transport system around Foggia during the busy summer period to help migrants, and their members joined the migrants’ march on Wednesday.

More than 650,000 migrants – mostly from sub-Saharan Africa – have come ashore in Italy since 2014, stretching resources in regions already struggling with high unemployment.