The Philadelphia Police Department said Tuesday that it fired the officer who shot and killed a fleeing 12-year-old boy.

“I've made the decision to utilize Commissioner's Direct Action to suspend Officer number one with the intent to dismiss the officer at the end of 30 days due to violations of our use of force directive," Police Commissioner Danielle Outlaw said at a Tuesday news conference.

“Based off of the evidence that I reviewed, it was clear that the use of force policy was violated," Outlaw said. "I will tell you that all use of force has to be proportionate to the resistance they're trying to overcome. I will also tell you that our policy clearly states that excessive force will not be tolerated,” she said.

Thomas Siderio was shot on March 1 after police spotted him and another 17-year-old who appeared to be holding a gun, police reported. The officers continued to drive towards them and turn on the sirens, and this is when the shots were allegedly fired at the police. The police then chased the two teens and shot Siderio.

Last week, Outlaw called the incident a “failure to society” and said that “the life of a young man was cut tragically short.”