Man arrested over Victoria child abduction

A man wanted over the abduction and sexual assault of a young boy in Melbourne has been arrested in NSW.

Victorian police contacted their NSW counterparts on Tuesday about a man they were searching for following a nine-year-old boy's abduction and assault last week.

Acting on the tip-off, police stopped a car on Tuesday night in the western Sydney suburb of Auburn, and arrested the 21-year-old driver.

The man was refused bail and will appear in Burwood Local Court on Thursday.

Police from the Victorian sex crimes squad have travelled to Sydney to seek the man's extradition.