At least 18 high-rise buildings in Kharkiv, Ukraine, were damaged by Russian military attacks overnight, the mayor reported Sunday.

The bombs fell Saturday night in Kharkiv, the second-largest Ukrainian city, damaging 18 buildings north of its center, the city council said.

KYIV, Ukraine (AP) -- Russia launched new strikes in the Ukrainian city of Kharkiv that hit high-rise apartment buildings, leaving at least 21 wounded in a second consecutive nighttime attack, authorities said.