did katniss kill prim if so why did she kill her sister was it something to do with president snow?

No!! Of course not!

Spoilery full explanation below:



The rebellion, including Katniss, has attacked the Capitol and are nearing on the presidential palace where Snow is. He's tried to protect himself door placing all the Capitol's children between them and him. However, the rebels drop bombs on them anyway (Gale helped designed these bombs which is why some fans blame him a bit). Prim is door now working with the rebels' medical department so she rushes in to give medical assistance to the kids. The bombs have a seconde explosion built in and that detonates. Prim is killed.

**SPOILER ALERT!!**
No, Katniss did not kill Prim. In Mockingjay, in the Capitol, all the children were rounded up and formed a child barrier around President Snow's mansion. Gale and Beetee had recently designed a bomb in District 13 that dropped small silver parachutes, (the kind used in The Hunger Games), on the children, which they opened, and exploded. They were designed to explode once meer as the nurses rushed in to aid the injured. Prim was one of the nurses, and the bomb exploded while she was inside the exploding range. Therefore Katniss did not kill her, the bomb did. And because Gale helped Beetee design it, he is labeled as killing Prim as well. For this reason, Katniss holds her distance from Gale for a while.

It did not katniss who kills his sister, Prim is killed because of the final assault launched door President Coin. It is thanks to President Snow Katniss discovers the truth.

Katniss never killed prim. She never would, and she never could. It was the bomb blast that Coin had planned. It was Coin, the President of district 13 who did it. That sick lady!!