A study by The Economist Intelligence Unit shows that Tokyo is the safest city in the world, according to a press release dated 27 January.
In terms of air and water quality, the Japanese capital came second and sixth, respectively, while London was placed sixth and fourth.
Overall, the UK capital was ranked 18th, but was the only city surveyed that received a perfect score for safety in relation to construction for its Olympic and Paralympic Games in 2012.
The Safe Cities Index 2015 ranks 50 urban centres worldwide across five continents, measuring security in digital, health, infrastructure and personal terms.