Elie Wiesel's Geysers of Blood

In his work Against Silence: The Voice & Vision of Elie Wiesel, Vol 2 (1985), Wiesel says of an alleged massacre of jews at Babi Yar, Ukraine:

"Later, I learned from a witness that for months after the massacre, the ground did not stop trembling and that from time to time, geysers of blood spurted up out of the earth."