UPDATE 2.30PM MONDAY
Queensland police have located two children after a woman took them and fled to NSW, the ABC reported.
Officers were also hunting for a 17-month-old girl who was taken by a man in separate incident on Sunday. She has been found safe and located with family about 1pm on Monday.
Police said a man, 35, was known to the child went to the home near Logan on Sunday afternoon and left with the girl shortly afterwards.
Queensland police are still searching for the 35-year-old transient man who took her from the Boronia Heights home.
An eight-year-old boy and a four-year-old girl from Harristown in Toowoomba, west of Brisbane, have been found.