Grigor Stoichkov, bivši visoki zvaničnik vladajuće komunističke partije u Bugarskoj u to vrijeme, izjavio je ranije u toku godine kako je za eksploziju u Černobilu saznao 2. maja, dan nakon masovnih proslava Dana rada u Sofiji.
Grigor Stoichkov, a former senior official from the ruling communist party in Bulgaria at the time, said earlier this year that he learned about the explosion at Chernobyl on May 2nd, a day after the mass Labour Day celebrations in Sofia.