At least 16 people were killed on Sunday, when a female suicide bomber detonated an explosive device inside a train station in Volgograd, Russia.
Russia Today, a government funded English-language news outlet, reports that authorities are treating the incident as a terrorist attack.
NBC News reports this is the second deadly attack in three days and it comes just as Russia is getting ready to host the Winter Olympics.
“On Friday, a car bomb killed three people in the southern Russian city of Pyatigorsk, 170 miles east of Sochi,” NBC reports. “In October, another female suicide bomber was blamed for a bus explosion in Volgograd that killed five people.”
The AP reports that security cameras show that the suicide bomber detonated the device as she was preparing to pass through a metal detector.