Bulgaria–United States relations to work. Bulgaria became a member of the Warsaw Pact on May 14, 1955. Though no Soviet troops were stationed on Bulgarian soil, in 1968, Zhivkov sent a Bulgarian division to join Polish, Hungarian and Soviet troops to crush a popular uprising in Prague. In 1978, the Bulgarian secret police were implicated in the assassination in London of Georgi Markov, a Bulgarian dissident who was a correspondent for the BBC World Service, Deutsche Welle radio and the U.S. sponsored Radio Free Europe. Markov was assassinated with a poisoned umbrella on September 7, Zhivkov's birthday. The rise of democratic movements across
Chapel of St Thomas on the Bridge were dismantled, exposing the vaults and columns of the Lower Chapel, an event that was recorded by Edward William Cooke in an engraving published in 1833. Chapel of St Thomas on the Bridge The Chapel of St Thomas on the Bridge was a bridge chapel built near the centre of "Old" London Bridge in the City of London and was completed by 1209. In 1548, during the Reformation, it was dissolved as a place of worship and soon afterwards converted to secular use. The building survived as a dwelling and warehouse until 1747 when the upper storey at street level