A big boom happened in a city called Lviv, and it made lots of people hurt, two of them really badly.
Some houses caught fire, and even some schools had to close for a while because of the loud noises.
There were also explosions in Kyiv, where people heard loud booms in the sky, as they tried to stop the bad guys from hurting people.
This all happened just after another big boom in a different city, where many people were hurt too, and they are still trying to help those who are hurt.
