An ambulance was seen leaving the scene immediately afterward early Monday evening.
Six of the twelve boys trapped in the cave in Thailand have been rescued according to the local officials.
Numerous boys trapped in the cave with their soccer coach can not even swim, and some are weak and exhausted from malnourishment.
Footage released by authorities showed groups of soldiers carrying what appeared to be two of the boys on stretchers into the back of waiting ambulances which then sped off for a nearby hospital.
Authorities have also declined to provide the names and identities of the boys who were rescued. "They have not been moved to Chiang Rai hospital yet", Tossathep told the Kyodo news agency.
Thai governor Narongsak Osottanakorn described the first rescue as "our masterpiece work" and claimed the four rescued boys were in "perfect" health - despite earlier reports that one was being "closely monitored". A Thai Navy SEAL commander told reporters he believed there was "a limited amount of time" left to rescue the soccer team.
Prayuth also declined to answer questions about health of the four boys rescued yesterday.More news: Arsenal complete move for Sampdoria midfielder Lucas Torreira
The second operation started at 11 a.m. local time Monday.
It was the rain that stranded the boys and their coach inside the cave to begin with, after they ventured into the cave network last month.
The four rescued boys, who were trapped for 16 days deep in the cave, were safely retrieved from their underground tomb after a treacherous journey in which elite divers escorted them through narrow passages and flooded areas that required the use SCUBA gear to get through, before trudging through mud and waist-high water on foot. More air canisters will be placed by the divers along the underwater route.
Eight boys and the coach remain inside the Tham Luang Nang Non cave as authorities paused the worldwide effort to replenish air tanks along the treacherous exit route.
Let's hope the rest of the ambitious operation goes as successfully as its first stage.
A major concern of the rescuers is that oxygen levels in their safe space could fall dangerously low. But the Denver Fire Department captain said the rescue mission to save a youth soccer team in Thailand is "unbelievable".
The rescuers needed at least 10 hours to prepare for their next operation, involving about 90 divers in total, 50 of them from foreign countries, he said. Musk said based on "feedback from Thailand", the engineers chose to build a "tiny, kid-size submarine" using a large silver tube meant to be affixed to a SpaceX Falcon 9 rocket.More news: Prince Louis' Godparents Revealed Ahead of Today's Christening
The contraption went through dive-pool tests at Palisades Charter High School in Los Angeles and was sent on a 17-hour flight to Thailand.
His parents, along with other families, have maintained a constant vigil at the site since the boys became trapped.
Asked whether the remaining four "Wild Boars" team and their coach would come out at the same time in the next rescue effort, he said: "It depends on the plan".
The next phase of the operation would start Monday after rescue teams replenish the supply of oxygen tanks along the route to ensure the safety of the journey, which takes several hours.
Somboon Sompiangjai, 38, the father of one of the trapped boys, said parents were told by rescuers ahead of Sunday's operation the "strongest children" would be brought out first.
Doctors are monitoring them for any illnesses they may have picked up in the cave, and supervising efforts to build up their strength after they spent more than two weeks with little food and no natural light.
But Thai authorities had already began there rescue efforts before the vessel was completed without Mr Musk's help.More news: Netflix Debuts "Smart Download" Feature As Boost For Binges
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