Queensland police are seeking urgent public assistance to locate four children who were taken by a man known to them north of Mackay yesterday.
Police issued an amber alert and said the children could be "at significant risk".
Authorities said the children were taken from a property on Maraju Yakapari Road at The Leap about 11:30am on Thursday in a white 2005 Nissan Patrol 4WD with licence plates 063-BC9.
The children are aged eight, seven, four and three and are described as Caucasian in appearance with a slim build and brown hair.
The man, 28-year-old Joshua Carter of The Leap, is described as Caucasian in appearance, of solid build and about 175 centimetres tall.
Police said he has "a shaven head and full, bushy beard with multiple face and body tattoos, including Batman Joker-themed facial tattoos".
They have asked the public to call 131 564 with information about the abduction or triple-0 for life-threatening information.