bhubaneswar india least 16 people die sunday tourist boat capsize southern indian state andhra pradesh officials say accident take place krishna river 25 km 15 miles vijayawada city district administrative chief b. lakshmikantham tell reuters administration investigate exactly cause incident initial probe find private boat operator necessary permission ferry people lakshmikantham say around 20 roughly 35 people boat rescue search operations continue india national disaster response force say twitter least 16 dead boat capsize south india officials