A leading Irish children's charity has appealed to the public to report anything at home or abroad that might aid the search for the two missing Belgian girls.
The disappearance of step-sisters Stacy(7) and Nathalie(10) in Liege nearly two weeks ago has gripped Belgium and prompted a frantic search across the state.
The Irish Society for the Prevention of Cruelty to Children (ISPCC) said - as members for the European Federation for Missing and Sexually Exploited Children - that it was calling for public assistance in the case.
The ISPCC said members of the public should be especially vigilant whilst on holidays as these children could be anywhere.
It requested anyone with information to contact its Leanbh service on 1800 67 67 67.
Stacy Lemmens is described as being one metre 20 centimetres tall and of average build with dark brown eyes. She was wearing plain shorts with an orange - red flower on the leg.
Nathalie Mahy is described as being one metre 40 centimetres tall and of slim build with straight brown hair and grey/green eyes. She was wearing a pink T-shirt with a silver motif, blue jeans and orange and green boots when she disappeared.