Thousands of Lebanese have rallied in central Beirut to mark the first anniversary of the assassination of former prime minister Rafik al-Hariri. His death in a car bomb attack shook up the the country’s political status quo. Twelve months later many Lebanese feel disappointed with the progress of change. They say the spirit of unity drawn across sectarian lines has withered away.After Damascus was blamed for masterminding the attack, Syrian troops withdrew. But failure to pinpoint the culprits has bred frustration. As well as claiming the life of Hariri, the blast in Beirut killed 20 other people. UN investigators have had to ask for more time to complete their probe, complaining of a lack of cooperation from Syrian officials, who deny any involvement in the attack.