![Mourners place flowers at the Tekhnologichesky Institut subway station in St. Petersburg to commemorate victims of the April 3, 2017 suicide bombing on a subway train.](/sites/default/files/multimedia_images_2017/201712eca_russia_stpetersburgmourners.jpg)
Mourners place flowers at the Tekhnologichesky Institut subway station in St. Petersburg to commemorate victims of the April 3, 2017 suicide bombing on a subway train. The attack killed 16 people and injured 50 others.
© 2017 Alexander Petrosyan/Kommersant Getty Images.