Row threatens Madonna's adoption

Madonna took custody of David Banda in October 2006

Madonna's adoption of a Malawian baby could be under threat after an official assigned to the case was refused permission to travel to the UK.

Social worker Penstone Kilembe was due to monitor the child's progress in two trips to the pop star's London home.

But he said the Malawian government had stopped the visits, telling Reuters the adoption process "may crumble".

The government was not available for comment, but reports said a different official would now travel to London.