The Kremlin guards march past candles and flowers placed in memory of the victims of Wednesday's attack on a vocational college in Kerch, Crimea, at the memorial stone with the word Kerch in the Alexander Garden near the Kremlin, Moscow, Russia, Thursday, Oct. 18, 2018. A top official in Crimea says authorities are searching for a possible accomplice of the student whose shooting-and-bomb attack on his vocational school killed 20 people and wounded more than 50 others.[Photo: AP/Pavel Golovkin]

People bring flowers and candles to honor the victims of Wednesday's attack on a vocational college in Kerch, Crimea, in the Alexander Garden near the Kremlin, Moscow, Russia, Thursday, Oct. 18, 2018. A top official in Crimea says authorities are searching for a possible accomplice of the student whose shooting-and-bomb attack on his vocational school killed 20 people and wounded more than 50 others. [Photo: AP/Pavel Golovkin]

Women light candles in memory of victims of shooting in the vocational college in Kerch, Crimea, in a church in St.Petersburg, Russia, Thursday, Oct. 18, 2018. An 18-year-old student strode into his vocational school in Crimea, Wednesday, then pulled out a shotgun and opened fire, killing 19 students and wounding more than 50 others before killing himself.[Photo: AP/Dmitri Lovetsky]