The man, who blew himself up, was identified as 46-year-old Rasim Aliyev and the other, who was wounded in his leg, is police officer Ruslan Demirchiyev.
According to Demirchiyev, he spotted a suspiciously behaving man wearing a black mask, later identified as Aliyev, and began following him. As he approached closer he saw that the man was carrying a gun. Demirchieyv immediately began calling for a backup from his colleagues, when an explosion followed.
Police launched an investigation into the incident.