BUCHA, Ukraine (AP) — The lush green beauty of a pine forest with singing birds contrasted with the violent deaths of newly discovered victims of Russia's war in Ukraine, as workers exhumed bodies from another mass grave near the town of Bucha on Kyiv's outskirts.

The hands of several victims were tied behind their backs. The gruesome work of digging up the remains coincided with the Ukrainian police chief's report that authorities have opened criminal investigations into the killings of more than 12,000 people since Russia' invaded Ukraine on Feb. 24.

Workers wearing white hazmat suits and ma...