A 21-year-old former student opened fire inside his school in Austria’s second-biggest city Tuesday morning and killed 10 people.

"I think the first thing is shock, to be honest. I think you can't react the other way. I think everyone in the school is in complete shock," said 24-year-old student Helene Parr, who knows people at the BORG Dreierschützengasse school, where the mass shooting took place.

With Austria still reeling from this week's deadly school shooting that killed 10 people, a debate is now raging over the Alpine country's gun laws.