Protesters mass in central London. Hundreds of thousands of teachers and civil servants were set to strike over planned pension cuts. (Andy Rain / EPA)
Protesters gather near Parliament in London. British unions said about 750,000 workers were expected to join the one-day strike, disrupting courthouses, tax offices and employment centers, as well as schools. (Andy Rain / EPA)
Police accompany demonstrators in London. (Andy Rain / EPA)
Protesters are demanding that the government rethink its plans to curb public sector pensions. (Ben Stansall / AFP/Getty Images)