Authorities in Zimbabwe say at least 90 elephants have been killed in the country's worst case of ivory poaching. The animals died after drinking from water holes poisoned with cyanide.\n\nThe carcasses were found in Hwange National Park and some of them had turned skeletal.\n\nPolice have arrested nine people. They say the accused poachers hid ivory tusks in the park.\n\nIvory tusks are illegally exported to Asia. Trade in ivory is banned under the Convention on International Trade in Endangered Species of Wild Fauna and Flora.