Off-duty border patrol agent chased San Diego synagogue shooter, opened fire

The horrific shooting Saturday at the Chabad of Poway synagogue in San Diego claimed one life, and left three others injured, including the Rabbi, on the last day of Passover.

A 19-year-old man, John Earnest, is under arrest in the attack, that appears to have been an act motivated anti-Semitism and hatred. USA Today, CBS, an other outlets report that the killer authored a "manifesto" similar to that of the shooter in the New Zealand mosque massacre, and cited that incident as inspiration, reported Reuters on Saturday evening.

One of the three injured victims is a one-year-old infant.

In a press conference, police said there may be 'digital evidence" also linking Earnest to a mosque arson last month, also in California.

As the events unfolded, an off-duty border patrol agent, reportedly working as a guard at the synagogue, chased the shooter. The officer drew his weapon and opened fire, hitting the suspect's vehicle as he fled.

President Trump tweeted his gratitude for that agent's heroic actions.

In the document that media are identifying as the killer's manifesto, which was posted online under his name around the time of the attack, the author referred to Trump as a "Zionist, Jew-loving, anti-White, traitorous, c**ksucker", and said that "every Jew is responsible for the meticulously planned genocide of the European race." There were many more, and worse, things written.

The shooting at the synagogue is a developing story, and this or other articles here may be updated as new information becomes available.

Watch Sheriff Gore discuss the investigation below, via ABC News.