A letter bomb has exploded in Victoria Street in London. Sky News' Home Affairs Correspondent Mark White said the device exploded at 9.40am. A female employee at the office where the letter was delivered was slightly injured - she is understood to have opened the envelope. The main road outside the building, which is just 200 yards from Scotland Yard, was closed off with a cordon set up around the entrance. A police spokesman said: "We were called at around 9.40 this morning to reports of a suspect package at a business address in Victoria Street. "A female employee...