* Missing ... April Jones.
April was seen playing with friends near her home and then getting into a grey or light coloured van at 7.30pm.
Hundreds of local people have been helping in a search of streets, farmland and woodland through the night.
Det Ch Supt Simon Powell of Dyfed-Powys Police said officers were "becoming increasingly concerned for her safety".
Local people gathered at Machynlleth Leisure Centre on Monday evening to help look for the girl, as news of her disappearance spread on social network sites.
A crowd of people had also gathered in the town's main street to take part in the search, and posters of April have been put up.