Three people have been killed and 16 have been wounded by a U.S. soldier who opened fire at the Fort Hood military base in Texas and then took his own life. The gunman was identified as Ivan Lopez, an Iraq War veteran who was being treated for mental illness. He was being evaluated for post-traumatic stress disorder but had not yet been diagnosed. President Obama reacted to the shooting during a trip to Chicago.

President Obama: “We’re heartbroken that something like this might have happened again. And I don’t want to comment on the facts until I know exactly what has happened. But for now, I would just hope that everybody across the country is keeping the families and the community of Fort Hood in our thoughts and in our prayers. The folks there have sacrificed so much on behalf of our freedom. Many of the people there have been through multiple tours in Iraq and Afghanistan. They serve with valor, and they serve with distinction. And when they’re at their home base, they need to feel safe.”

At least three of the surviving 16 victims are listed in critical condition, some suffering multiple gunshot wounds. Fort Hood is the same base where 13 people were killed and 32 wounded in a 2009 shooting also by a U.S. soldier.