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Cameron tweet congratulates Obama
President Barack Obama waves after delivering his Inaugural address at the ceremonial swearing-in at the US Capitol (AP pic)
David Cameron has said he is "delighted to continue working together" with Barack Obama as the US president took the oath of office for a second White House term.
The Prime Minister offered his congratulations via Twitter after Mr Obama delivered his inaugural address in a day of pomp and ceremony in Washington.
"Congratulations to @BarackObama on his second inauguration. Delighted to continue working together," said his message.
Mr Obama urged his country to "seize the moment" as it emerged from a decade of war and deep economic woes.