ILE DE SAINTE-MARIE, Madagascar,(Pakistan Point News - APP -23rd Augst,2016) : Police investigating the double murder of two French volunteers on an island off Madagascar have arrested four suspects. Authorities arrested the four people, who were at the same place as the two victims on Sunday but have not yet established a firm link to the murders. There is "no doubt" the two volunteers were murdered, police said. "We just need to determine a motive." The bodies of the two French citizens, a man and a woman aged in their 20s, were found Sunday on a beach on the resort island of Sainte Marie with head injuries. They had been volunteering at Cetamada, a local environmental non-profit organisation working to protect ocean mammals.