A student caught up in the Florida school massacre calls Trump a “f*****g piece of s**t” on Twitter over Trump’s tweet of condolence.

The reply by “Sarah” to Trump’s tweet of condolence went viral after she urged him to introduce gun control measures instead of platitudes.

The president had tweeted his “prayers and condolences” to the families of those murdered, adding: “No child, teacher or anyone else should ever feel unsafe in an American school.”

The girl attending Marjory Stoneman Douglas High School in Parkland, near Fort Lauderdale, replied: “I don’t want your condolences you f*****g price (sic) of s**t, my friends and teachers were shot.

“Multiple of my fellow classmates are dead. Do something instead of sending prayers. Prayers won’t fix this. But Gun control will prevent it from happening again.”

By Thursday morning her reply had been retweeted 65,000 times and liked by more than 154,000 people.

Seventeen people were killed when a 19-year-old Nikolas Cruz opened fire with an AR-15 semi-automatic rifle on Wednesday.

Sarah’s account has posted a number of tweets relating to Parkland and the school in recent weeks, and she appeared to have attended a Lana Del Rey concert in Florida earlier in February.

After responding to Trump’s tweet of condolence, the girl tweeted: “Today has been the worst day of my life. I’ve been crying helplessly for hours. Thank you to everyone for your support. I’m going to try to sleep now.”