Serzh Sarkisian has been sworn in for a second term as Armenia's president in the capital, Yerevan, amid an opposition challenge to the credibility of his reelection. Sarkisian's main challenger in the February vote, Raffi Hovannisian, held what he had called an "alternative inauguration." Thousands of Hovannisian's supporters tried to march to a memorial using an avenue where the presidential palace is also located. They were blocked by police cordons.