'I don't want your condolences, you piece of s***' - Student slams Trump over gun control after 17 killed at Florida school
The president tweeted: "My prayers and condolences to the families of the victims of the terrible Florida shooting.
"No child, teacher or anyone else should ever feel unsafe in an American school."
Parent John Obin said his son, a student at the school, was in class when he heard several shots.
The father said his son advised that teachers quickly rushed students out of the school.
"This is a really good school, and now it's like a war zone," Mr Obin said.