Ihor Zinkevych, an official with the Lviv city council reported late on March 31 that a grenade exploded in a high-rise on Zamarstynivska Street in northern Lviv.
One person was killed and one more injured, according to Zinkevych.
It is unclear who was in a possession of the grenade.
First responders are working at the scene.
No further information was provided at the time of the publication.