Learning More About Webster Ambush

December 26, 2012 Updated Dec 26, 2012 at 9:38 AM EDT

By WKBW News

December 26, 2012 Updated Dec 26, 2012 at 9:38 AM EDT

WEBSTER, NY (WKBW) - The gunman, accused of starting a fire then shooting the first responders on scene, also wrote a suicide note.

Police said it all started when William Spengler set the home he shared with his sister on fire. When first responders arrived on scene, he shot at them. Spengler hit two men, killing them. Two others were injured. He then turned the gun on himself.

The body of Spengler's sister, Cheryl, was also found inside the burned down home. Authorities are not yet certain whether she died before or during the fire. Six other homes were also set ablaze. Those families were evacuated.

In the shooting, Spengler had three weapons in his arsenal. He used a Smith and Wesson .38 caliber revolver, a Mossberg 12 gage pump shotgun and a Bushmaster .223 rifle, similar to the gun used in the Sandy Hook Elementary massacre.

Meanwhile, a suicide note written by Spengler was found. Although it's not being released to the media, police officials did read parts of that letter.

"I still have to get ready to see how much of the neighborhood I can burn down, and do what I like doing best killing people,"

Among the dead are volunteer fireman Mike Chiapperini and Thomasz Kaczowka. Two other fire fighters were also shot and are recovering from their injuries.

Neighbors said Spangler and his sister shared the home but did not get along and fought often.

Meanwhile, investigators continue to find out how and why Spengler had access to so many firearms. He was convicted and served 17 years in prison after killing his grandmother with a hammer.