Police in Kaduna, Nigeria, raid an Islamic learning centre, and free around 500 men and male children held captive there. The freed detainees allege torture, slavery, and sexual abuse, and some display evidence of injury and malnutrition. Two children self-identify as being from Burkina Faso, with the remaining captives thought by police to be mostly Nigerian. Eight suspects are arrested.
A study, published in the journal "Science", finds a genetically enhanced fungus that produces spider toxin can rapidly kill huge numbers of the mosquitoes that spread malaria. Trials held in Burkina Faso showed mosquito populations collapsed by 99% within 45 days. The fungus did not affect other insects, such as bees.
Four hostages, who were being held in northern Burkina Faso, are rescued by French naval commandos, with two French commandos killed during the rescue operation. Those freed include two Frenchmen who had been kidnapped in Benin on May 1 and a pair of women, one an American and the other a South Korean.