Two-time Olympic champion former biathlete Dmitri Vasilyev said the attack on children and civilians in the Bryansk region should be reported to all relevant authorities.
Emphasizing the severity of the attack, Vasilyev stressed that the incident must be kept on the agenda.
Bus carrying Belarusian children's football team targeted
The regional administration had previously reported that a bus carrying a children's football team from the Belarusian city of Homel was targeted by an aircraft-type drone. The team was travelling to Gelendzhik for a holiday.
A woman accompanying the group was killed in the attack. The deceased was the wife of one of the coaches.
According to the Russian Ministry of Health, the number of injured has risen to seven. Five of the injured are children, all of whom are receiving medical care.
Investigation opened into terrorist attack
The Russian Investigative Committee has opened a criminal case into the incident on terrorism charges.
The Belarus Football Federation also announced that it had informed the heads of FIFA and UEFA of the attack.