Sophie and Colin Hortman released the following statement on behalf of the Hortman family: “We are devastated and heartbroken at the loss of our parents, Melissa and Mark. They were the bright lights at the center of our lives, and we can’t believe they are gone. Their love for us was boundless. We miss them so much.”

Sophie and Colin Hortman are responding to the fatal shooting of their parents, Minnesota state Rep. Melissa Hortman and Mark Hortman. In a written statement released Monday night, Sophie and Colin Hortman said they're "devastated and heartbroken.

A manhunt is underway for the gunman who was impersonating a police officer and had a list of possible targets, officials said.

The children of Melissa Hortman and her husband Mark Hortman are speaking out on their parents' murders. “They were the bright lights at the center of our lives, and we can’t believe they are gone," Sophie and Colin Hortman wrote in a statement obtained by PEOPLE Monday.

Vance Boelter, the man accused of shooting two Minnesota state legislators and their spouses, visited the homes of four lawmakers over the course of a few hours early Saturday. Federal prosecutors have charged Boelter,

Democratic House Speaker Melissa Hortman and her husband, Mark, lost their life in a fatal shooting in their home in the northern Minneapolis suburbs.

In an interview with PEOPLE, Dante Tomassoni, the son of late state Sen. David Tomassoni, says Hortman was instrumental in crafting legislation that went toward ALS research while his father was afflicted with the disease. Related: Suspect Vance Boelter Caught, Charged with Second-Degree Murder in Minnesota Lawmaker Shootings