Peter Mutharika has been sworn in as Malawi's president after the High Court rejected a request for a recount following allegations by former president Joyce Banda of vote-rigging.

The leader of the Democratic Progressive Party urged the 11 other presidential candidates to "join me in rebuilding the country".

Banda, who came to power two years ago, was third with 20.2% of the vote. Her administration had been hit by a corruption scandal which led donors to cut aid. Three people have been killed in violence after the ballot.