Desperate search for 12 children trapped in Thailand cave

Thai rescue personnel at the entrance of Tham Luang cave in Chiang Rai province. AFP

Desperate parents led a prayer ceremony outside a flooded cave in northern Thailand where 12 children and their football coach have been trapped for days, as military rescue divers packing food rations resumed their search on Tuesday.

Hundreds of people have been mobilised to find the youngsters who went into the Tham Luang cave on Saturday and were trapped when heavy rains flooded its main entrance.

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Anxious relatives camped out to perform traditional rituals, making offerings and reciting emotional prayers for their children's safe return.

"I asked for all God's wishes, but I'm certain in my heart that they will survive. They have been inside the cave before," the father of one of the young footballers said.

Some relatives wailed at the cave's entrance near the Laos and Myanmar border, where huge crowds have gathered near stockpiles of water and food.

"My child, I'm here to get you now," one crying parent said, while another screamed: "Come home my child."

The children, who are between 11 and 16 years old, are thought to have retreated further into the tunnel as monsoon rains fell and flooded the cave, believed to be several kilometres long.

Rescuers found bicycles, football boots and backpacks at the entrance to the site Monday, and divers said they spotted footprints in one of the cave's chambers.

Park officials, police and soldiers were dispatched on foot, while an aerial team was also being mobilised to see if there was another entrance to the cave, according to an AFP photographer at the scene.

Navy divers equipped with oxygen tanks and food rations entered the cave early on Tuesday in northern Chiang Rai province where rain continued to fall.

Rescue teams were also dispatched to light the inside of the cave and drain water from the site and an underwater robot was set to be dispatched to survey the area and help rescuers.

Interior Minister Anupong Paojinda said they were working around the clock to find the youngsters.

"We're working against time, but we're not panicking," he told reporters.

Forecasters said rains are expected to continue on Tuesday, which could hamper rescue efforts.

Tham Luang cave is not hugely popular among foreign tourists because of its remote location, but draws locals to worship at small Buddha statues inside.

Downpours routinely pound Thailand during the monsoon season from May to October, often causing flooding and landslides.

Fifteen people died in flooding in December that submerged large swathes of Thailand's south and hit hundreds of thousands of households.

This is not the first cave accident in the country.

Six foreign tourists and two Thai guides were killed in 2007 when they were swept away by flash floods in a cave in Khao Sok National Park in southern Thailand.

The fiance of one of the tourists killed in the accident survived after clinging onto a ledge in the cave for 21 hours.