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Police in Western Australia are offering a A$1m (£542,845) reward for information about the disappearance of a four-year girl.
Cleo Smith was last seen in her family's tent at about 1.30am on Saturday at the remote Blowholes Shacks campsite in coastal town Macleod, which is about 900km (559 miles) north of Perth.
When her parents woke at 6.30am, she was gone and is believed to have been abducted, police said.
Western Australian Police said it holds "grave fears" for her safety.
The region's premier Mark McGowan said in a Facebook post: "It's absolutely heartbreaking."
"We are all praying for a positive outcome," he added.
More than 100 police officers, defence force and state emergency service personnel have joined the searches by air, sea and land.
Australian police said on Monday that they would keep searching for the little girl until they can provide answers about what happened.
Meanwhile, they have urged members of the public to come forward.
They earlier released to the public a picture of a sleeping bag and a pink pyjama one-piece that Cleo was last seen in.
Local media reported that the family had been visiting for a weekend camping trip, but were now staying in the remote area.