FILE - In this Monday, Oct. 29, 2018 file photo, a person stands in front of Stars of David that are displayed in front of the Tree of Life Synagogue with the names of those killed in Saturday's deadly shooting in Pittsburgh. A Jewish civil rights group says at least a dozen white supremacists have been arrested on allegations of plotting, threatening or carrying out anti-Semitic attacks in the U.S. since the massacre at the Pittsburgh synagogue in 2018. (AP Photo/Matt Rourke, File)

COLLEGE PARK, Md. (AP) — At least 12 white supremacists have been arrested on allegations of plotting, threatening or carrying out anti-Semitic attacks in the U.S. since the massacre at a Pittsburgh synagogue nearly one year ago, a Jewish civil rights group reported Sunday.

The Anti-Defamation League also counted at least 50 incidents in which white supremacists are accused of targeting Jewish institutions' property since a gunman killed 11 worshippers at the Tree of Life synagogue on Oct. 27, 2018. Those incidents include 12 cases of vandalism involving white supremacist symbols and 35 cases in which white supremacist propaganda was distributed.

The ADL said its nationwide count of anti-Semitic incidents remains near record levels. It has counted 780 anti-Semitic incidents in the first six months of 2019, compared to 785 incidents during the same period in 2018.

The ADL's tally of 12 arrests for white supremacist plots, threats and attacks against Jewish institutions includes the April 2019 capture of John T. Earnest, who is charged with killing one person and wounding three others in a shooting at a synagogue in Poway, California. The group said many of the cases it counted, including the Poway shooting, were inspired by previous white supremist attacks. In online posts, Earnest said he was inspired by the deadly attacks in Pittsburgh and on two mosques in Christchurch, New Zealand, where a gunman killed 51 people in March.

The ADL also counted three additional 2019 cases in which individuals were arrested for targeting Jews but weren't deemed to be white supremacists. Two were motivated by Islamist extremist ideology, the organization said.

The ADL said its Center on Extremism provided "critical intelligence" to law enforcement in at least three of the 12 cases it counted.

Last December, authorities in Monroe, Washington, arrested a white supremacist after the ADL notified law enforcement about suspicions he threatened on Facebook to kill Jews in a synagogue. The ADL said it also helped authorities in Lehighton, Pennsylvania, identify a white supremacist accused of using aliases to post threatening messages, including a digital image of himself pointing an AR-15 rifle at a group of praying Jewish men.

In August, an FBI-led anti-terrorism task force arrested a Las Vegas man accused of plotting to firebomb a synagogue or other targets, including a bar catering to LGTBQ customers and the ADL's Las Vegas office. The ADL said it warned law enforcement officials about the man's online threats.

"We cannot and will not rest easy knowing the threat posed by white supremacists and other extremists against the Jewish community is clear and present," the group's CEO, Jonathan Greenblatt, said in a statement.

The ADL said it counted at least 30 additional incidents in which people with an "unknown ideology" targeted Jewish institutions with acts of arson, vandalism or propaganda distribution that the group deemed to be anti-Semitic or "generally hateful," but not explicitly white supremacist.

"These incidents include the shooting of an elderly man outside a synagogue in Miami, fires set at multiple Jewish institutions in New York and Massachusetts, Molotov cocktails thrown at synagogue windows in Chicago, damaged menorahs in Georgia and New Jersey, as well as a wide range of anti-Semitic graffiti," an ADL report said.

FILE - In this June 26, 2019, file photo, Rabbi Yisroel Goldstein, senior rabbi of Chabad of Poway synagogue in San Diego, Calif., address the United Nations General Assembly's meeting on combating antisemitism and other forms of racism and hate in the digital age at U.N. headquarters. A Jewish civil rights group says at least a dozen white supremacists have been arrested on allegations of plotting, threatening or carrying out anti-Semitic attacks in the U.S. since the massacre at a Pittsburgh synagogue in 2018. The Anti-Defamation League's Center on Extremism's tally of the arrests includes the April 2019 capture of John T. Earnest, who is charged with killing one person and wounding three others in a shooting at the Poway synagogue. (AP Photo/Bebeto Matthews, File)
FILE - This undated file photo provided by the Pennsylvania Department of Transportation shows Robert Bowers, the suspect in the deadly shooting on Oct. 27, 2018, at the Tree of Life synagogue in Pittsburgh. A Jewish civil rights group says at least a dozen white supremacists have been arrested on allegations of plotting, threatening or carrying out anti-Semitic attacks in the U.S. since the massacre at the Pittsburgh synagogue in 2018. (Pennsylvania Department of Transportation via AP, File)
FILE - In this Oct. 28, 2018, file photo a Pittsburgh Police officer walks past the Tree of Life synagogue and a memorial of flowers and stars in Pittsburgh, in remembrance of those killed and injured when a shooter opened fire during services at the synagogue. A Jewish civil rights group says at least a dozen white supremacists have been arrested on allegations of plotting, threatening or carrying out anti-Semitic attacks in the U.S. since the massacre at the Pittsburgh synagogue in 2018. (AP Photo/Gene J. Puskar, File)
FILE - In this April 29, 2019, file photo, a photograph of Lori Kaye, who was killed when a gunman opened fire inside the Chabad of Poway synagogue, is displayed at left, during Kaye's funeral in Poway, Calif., as her daughter Hannah speaks at right. A Jewish civil rights group says at least a dozen white supremacists have been arrested on allegations of plotting, threatening or carrying out anti-Semitic attacks in the U.S. since the massacre at a Pittsburgh synagogue in 2018. The Anti-Defamation League's Center on Extremism's tally of the arrests includes the April 2019 capture of John T. Earnest, who is charged with killing one person and wounding three others in a shooting at the Poway synagogue. (AP Photo/Gregory Bull, File)