South Yorkshire Police have confirm that missing Doncaster teenager Lorna Vickerage, 14, and 35-year-old John Bush have been arrested in London.
An off-duty officer recognised them near Euston Road station at 2.35pm today.
They had earlier been seen in Watford, north of the capital.
It brings to an end a national hunt for the pair.
Lorna is expected to return to Doncaster tonight.