He said the detections were `` an important and encouraging lead , '' but he cautioned that they be treated `` carefully '' as they have n't been verified as being related to Flight 370 . NEW : A Chinese ship picked up a signal on Friday and Saturday , authorities say . Sydney : An Australian naval vessel is investigating a more recent detection in a separate location . Singapore : An official calls the sounds ` ` an important and encouraging lead '' but urges caution . Up to 10 military planes , two civil aircraft,13 ships will participate in Sunday 's search .
NEW : A Chinese ship picked up a signal on Friday and Saturday , authorities say . Sydney : An Australian naval vessel is investigating a more recent detection in a separate location . Singapore : An official calls the sounds ` ` an important and encouraging lead '' but urges caution . Up to 10 military planes , two civil aircraft,13 ships will participate in Sunday 's search .