SOFIA (Reuters) - Bulgaria has decided to extend its investigation into the murder in 1978 of dissident Georgi Markov in London with a poison-tipped umbrella, a top investigator said on Wednesday.

Forty-five years ago, the Bulgarian dissident Georgi Markov was killed in London with a poison-tipped umbrella as he made his way home from work. The horrifying case transfixed the British public. So ...