Guwahati, July 11 -- At least 15 Indian tourists were killed and 21 others rescued after a speedboat carrying visitors capsized off Vietnam's southern Phu Quoc Island on Saturday, triggering a large-scale rescue operation by Vietnamese authorities.

According to officials, the speedboat was carrying 32 Indian tourists and four crew members while returning from Hon May Rut Ngoai Island to An Thoi Port when it overturned about 400 metres from the shore near Phu Quoc, one of Vietnam's most popular tourist destinations.

Initial rescue efforts were carried out by nearby tourist boats before border guards, the navy, coast guard and other emergency agencies reached the scene. Rescue teams managed to save 21 people, while the bodies of 15 victim...