Molotov Cocktail
A fire in a bottle that makes a big fire when thrown is called a Molotov Cocktail. Don't throw them in the house please.
かえんびん
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
男は火炎瓶を投げつけた。
The man threw a Molotov cocktail.