An explosion near the convoy of the British ambassador to Yemen on Monday killed one person, believed to be a suicide bomber, but the envoy was unharmed, a security source and British officials said. Ambassador Tim Torlot was on his way to the embassy when the blast occurred, the security source told Reuters. Three people were wounded, another security source said. Two were security officials in a police car escorting the ambassador's motorcade. The third was a bystander. Britain's Foreign Office confirmed that a small explosion took place beside the ambassador's car. He was unhurt and no other embassy staff were injured, it said in a statement. The embassy will be closed to the public indefinitely.