(CNN) — Two bridges have collapsed in Russia’s western regions bordering Ukraine, killing at least seven people and injuring dozens, authorities said.

It was not clear on Sunday morning whether the two incidents — which both involved trains — in neighboring Bryansk and Kursk were related, or what exactly caused the separate collapses.

At least seven people were killed in Bryansk when a road bridge gave way onto a passenger train late Saturday, with railway authorities citing “illegal interference.”

The bridge came down in the region’s Vygonichi district, about 100 kilometers (62 miles) from the Ukrainian border, crushing the moving train and injuring at least 66 people, including three children, Russian authorities reported.

Bryansk’s regional governor Alexander Bogomaz blamed the col

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