evidence: A group of residents from the Indian Ocean French island of Mayotte has been rounding up suspected illegal migrants and taking them to local police. [...] Mayotte is an island of 250,000 people that is part of the Comoros archipelago off the coast of Africa. [...] But Mayotte opted to remain part of France, voting overwhelmingly in 2009 in favour of becoming an integral part of France, mainly because of the economic benefits associated with becoming French.