The Investigative Committee on Wednesday released personal details about suicide bomber Ravzat Aziyalova and asked for help from citizens in finding her husband, also a suspect in Monday's deadly attack on a Volgograd bus.
Aziyalova, who killed six people and injured more than 50 in the bombing, had reportedly been working in Moscow for the last several years after leaving her native Dagestan. Investigators asked for information and cooperation from citizens in finding her husband Dmitry Sokolov, who is believed to be part of a terrorist organization and involved in planning the attack.
No organization has claimed responsibility for the bombing.
Sokolov, 21, has not been heard from since unexpectedly leaving his parents' Moscow region home last summer. The Investigative Committee said the pair first met three years ago and "were united by a common passion — radical Islam."
Wednesday also saw the first burial of the attack's victims, a young woman born in 1995, Interfax reported. More burials are expected in the coming days.
Twenty-five people are being treated in Volgograd hospitals, Vladimir Kuznetsov, a superintendent from local hospital No. 15, told RIA Novosti. One of the victims has had amputation surgery and remains in a serious condition.
The youngest victim, a 22-month-old boy, suffered a concussion and has been transferred to a children's hospital. His injuries are not life threatening.
The majority of the other victims have head injuries along with minor burns and wounds caused by shrapnel and broken glass.
On Tuesday, four of the more seriously injured passengers were flown via government aircraft to Moscow for treatment.
A three-day period of mourning has been declared in the Volgograd region.