The death toll in Tuesday's derailment on the Moscow metro now stands at 21, the Russian health ministry says.
http://www.bbc.com/news/world-europe-28306458
Scores were injured, some seriously, when a packed commuter train braked abruptly between stations in the west of the city in the morning rush hour.
Some of those hurt were carried out of the tunnel on stretchers, with the most serious cases airlifted to hospital.
The cause of the crash - one of the worst incidents ever on the metro - is reported to be a power surge