Following the incident, several riots erupted in Bakel, Dakar and other towns in Senegal, directed against the mainly Arabized Mauritanians who dominated the local retail business. The rioting, adding to already existing tensions, led to a campaign of terror against black Mauritanians, who are often seen as 'Senegalese' by Bidha'an, regardless of their nationality. As low scale conflict with Senegal continued into 1990/91, the Mauritanian government engaged in or encouraged acts of violence and seizures of property directed against the Halpularen ethnic group. The tension culminated in an international airlift agreed to by Senegal and Mauritania under international pressure to prevent further violence. The Mauritanian Government expelled thousands of black Mauritanians. Most of these so-called 'Senegalese' had few or no ties with Senegal, and many have been repatriated from Senegal and Mali after 2007. The exact number of expulsions is not known but the United Nations High Commissioner for Refugees (UNHCR) estimates that, as of June 1991, 52,995 Mauritanian refugees were living in Senegal and at least 13,000 in Mali.