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FBI opens domestic terrorism investigation into Gilroy garlic festival shooting

WATCH: The FBI announced Tuesday that it's opening a domestic terror investigation into the Gilroy, Calif. Garlic festival shooter after varying, competing ideologies were found to be looked at by him.

The FBI has opened a domestic terrorism investigation into the mass shooting at a California food festival after it discovered a “target list” compiled by the gunman whose relatives apologized Tuesday and said they were “horrified” by his actions.

The FBI disclosure came during a funeral mass for Keyla Salazar, a 13-year-old middle schooler who was one of three people killed on July 28 by gunman Santino William Legan during the Gilroy Garlic Festival. Thirteen others were injured.

READ MORE: Young man identified as gunman at California garlic festival

It was the first of three mass shootings within a week that killed a total of 34 people in Gilroy, Dayton, Ohio, and El Paso, Texas. The attacks have prompted widespread calls for gun reform and heightened mental health care.

The FBI has opened domestic terrorism cases in two of the attacks.

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In Gilroy, the FBI cited the 19-year-old Legan’s list of targets that included religious institutions, courthouses, federal buildings and both major political parties in the U.S.

Authorities say the gunman in Texas posted a racist, anti-Hispanic screed online. The FBI has not said if it is considering the Ohio case to be domestic terrorism, even though the shooter expressed a desire to commit a mass shooting.

WATCH: Gilroy festival shooting survivors talk about fleeing scene, thank emergency responders
Gilroy festival shooting survivors talk about fleeing scene, thank emergency responders
Gilroy festival shooting survivors talk about fleeing scene, thank emergency responders

In California, federal investigators and Legan’s family said they have not been able to come up with a motive for the festival attack.

However, John Bennett, FBI agent in charge in San Francisco, said the agency cannot rule out white nationalism as a factor.

On the day of the attack, Legan urged his Instagram followers to read a 19th century book popular with white supremacists who follow extremist websites. He also complained about overcrowding towns and paving open space to make room for “hordes” of Latinos and Silicon Valley whites.

The FBI says Legan appeared to be interested in conflicting violent ideologies, but authorities have not found a written explanation for his attack or any indication of previous violent behavior.

U.S. law does not contain a specific domestic terrorism charge. As a result, the FBI looks for possible hate crimes, weapons and other violations. Simply being a member or showing support for a white supremacist organization is not unlawful.

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READ MORE: Gilroy Garlic Festival shooting in California kills 3, hurts at least 15

However, such links are a crime in foreign terrorism cases, even if the investigation doesn’t involve accusations of violence.

In the El Paso case, authorities are weighing hate-crime charges that could carry the death penalty.

Family members of Legan released a statement saying they were “deeply shocked and horrified” by his actions. They also apologized to the victims and their families.

“We have never and would never condone the hateful thoughts and ideologies that led to this event, and it is impossible to reconcile this with the son we thought we knew,” the family said in a statement released by attorney Chuck Smith.

Legan grew up less than a mile from Christmas Hill Park, where the festival was held. His father was a competitive runner and coach; his brother was an accomplished young boxer; and his grandfather had been a Santa Clara County supervisor.

WATCH: Emotional statement from family of Keyla Salazar 

Emotional statement from family of Keyla Salazar
Emotional statement from family of Keyla Salazar

Police say Legan fired 39 shots from an AK-47-style rifle before turning the gun on himself during a shootout with three Gilroy police officers. He was wearing a bullet-resistant vest and carrying several high-capacity magazines, with more ammunition on the ground and in a bag in a nearby creek.

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Three officers, who responded within a minute, fired 18 times at Legan, police Chief Scot Smithee said.

The FBI says investigators continue to examine Legan’s digital media to determine his possible ideology, who he may have been in contact with regarding the ideologies, who if anyone helped him, and why he committed the violence, Bennett said.

The target list was found during the investigation of the digital evidence. Bennett said the groups included were being notified but the FBI would not release their names.