21 people have been killed and over 160 injured as several subway cars derailed on the Moscow Metro on the Arbatsko-Pokrovskaya dark blue Metro line on Tuesday morning, according to health officials.

21 people have been killed and over 160 injured as several subway cars derailed on the Moscow Metro on the Arbatsko-Pokrovskaya dark blue Metro line on Tuesday morning, according to health officials, RT reported.

“Currently there are 21 dead. Twelve people extracted from the cars were already dead, seven died in the station’s hall and two more people - a man and a woman – died in the 71st hospital from major traumatic injuries,” said head of the Health ministry Veronika Skvortsova as cited by RIA Novosti.

According to Skvortsova, 126 people are still hospitalized, five of whom are in a critical condition.

Moscow authorities have declared Wednesday a day of mourning for those who died in the accident.

Among the victims of the accident are a citizen of China and another from Tajikistan. While among the injured are residents of 12 Russian regions and five countries – Ukraine, Moldova, Tajikistan, Uzbekistan and Kyrgyzstan, said Russian Deputy Prime Minister Olga Golodets.