NSW police search for six-year-old girl

Police say they are seriously concerned for a six-year-old Sydney girl who along with her mother has not been seen in more than 24 hours.

Mariella Vittori and her mother Karina Gage, 31, were last sighted at a western Sydney shopping complex about 3.30pm on Friday.

It's believed they might be travelling in a white 2006 Peugeot with NSW registration CK55VK.

Ms Gage is described as Caucasian, 170cm tall and weighing about 50kg, with blonde hair and brown eyes. Her daughter is about 125 cm tall with brown hair and brown eyes.