I lean toward the single source used multiple times translation as well. At the same time, many news sources are indicating only 2 bodies have been recovered. That's a strangely small number unless the 2 pilots were insulated from a larger explosion.
https:// www.reuters.com/article/us-russia-airplane-crash/russian-passenger-plane-crashes-near-moscow-71-dead-idUSKBN1FV0LB?utm_source=Twitter&utm_medium=Social