Sofia, Shawwal 29, 1435, Aug 25, 2014, SPA -- A zoo in the Bulgarian capital has been closed after the mysterious death of several animals, dpa cited zoo director Ivan Ivanov as telling state radio on Monday. A camel, a yak and three wild oxen died over the weekend, according to the national broadcaster. The cause of their death is still unknown, but the Central Veterinary Institute will examine samples from their carcasses. It's still unclear when the zoo will reopen. --SPA 22:35 LOCAL TIME 19:35 GMT www.spa.gov.sa/w