However, others said they felt that guns were not the problem -- just better enforcement of laws and more arming of responsible citizens.
Wessel Smith from Pretoria, South Africa, owns a gun and carries it with him at all times. He said he wishes he didn't have to do so but said several years ago his wife had an AK-47 pointed at her during a robbery. The incident convinced him that "responsible citizens" with no criminal backgrounds should be armed.
"Gun control won't stop crazy men from murdering people in schools," he said, "(but) if I was a teacher at that school and I was carrying a weapon, that guy would have been dead."
Despite differing opinions on how to stop such crimes from being committed, many people said they were united in one thing -- grief for those parents who had lost a child.
"As a mother of two kids I understand there are no words that can support the poor parents," said one commenter from Russia who identified herself as Julia.
"I just want to say that people in Russia are crying with you now."