The operation to rescue the remaining eight boys and their football coach trapped in a flooded cave in Thailand resumed on Monday after four were brought to the surface yesterday.
The four unidentified boys freed were said to be in good health and recovering in hospital, although their parents reportedly remain unaware who has been rescued and who is still trapped.
The operation to rescue the group had resumed on Monday morning, Thai authorities said.
Heavy monsoon rains lashed the mountainous Chiang Rai region, where the Tham Luang Nang Non cave is situated, for several hours overnight.
The bid to rescue the schoolboys, aged between 11 and 16, was suspended on Sunday to replenish oxygen supplies and make new preparations.
Water levels will have an effect on the difficulty of the next stage of the rescue operation and it is not immediately clear how the rain overnight has affected levels inside the cave.
The heavy rain increases the risks in what has been called a "war with water and time" to save the boys.
