BREAKING: Suspect identified in San Jose mass shooting that left 9 dead

According to fire department sources, the suspect set fire to his own home and then opened fire during a union meeting. Cassidy reportedly has a history of domestic violence and is divorced.

At 6:34 am Wednesday morning police in San Jose received reports of shots fired at a Valley Transport Authority (VTA) rail yard. The call prompted a large law enforcement response according to the Santa Clara County Sheriff's Office. It was revealed later in the day that at least 9 people are dead including the shooter after the incident.

Sheriff's deputy Russell Davis called the rail yard a VTA "control center" which is a "hub that stores multiple VTA trains and a maintenance yard as well." Police credit a quick response time to the rail yard is within a half-mile of San Jose Police Department, Santa Clara County Sheriff's Office and District Attorney headquarters.

In a press conference, Mayor Sam Liccardo said he will, "do everything possible to ensure this never happens again in our city." The mayor pledged action saying, "In the next 48 hours I will be back in communication with you to talk about what we've been working on in the last year and a half and what we intend to in the week to come to ensure we never see a horrific tragedy like this in San Jose."

There have also been explosive devices discovered at the scene of the shooting according to Santa Clara County Sheriff Laurie Smith. Sheriff Smith also said a house fire in San Diego that may be connected to the incident. The Santa Clara Country Sheriff's office is planning another press briefing at 1:30 pm PST / 4:30 pm EST.

This is a breaking story and will be updated.