JERUSALEM (AP) -- The four men killed by two Palestinian attackers as they worshipped in a Jerusalem synagogue Tuesday were rabbis, and all were immigrants to Israel with dual citizenship - three born in the United States and one in England.
Here is a look at the four victims and their Palestinian assailants.
RABBI MOSHE TWERSKY
A Boston native who came from a line of influential rabbis, the 59-year-old Twersky was a "gentle, saintly scholar," said his brother-in-law in New York City, Rabbi Jonathan Rosenblatt.
"He lived his life with a kind of perfected modesty and precision," said Roseblatt, who is married to Twersky's sister, the former Tzipporah Twersky. "He lived in the image of a gentle God."
Called an "eminent educator" by New York's Yeshiva University, Twersky was the son of Rabbi Isadore Twersky, who founded Harvard University's Center for Jewish Studies, and the grandson of Joseph B. Soloveitchik, one of the most influential Jewish theologians of his generation.
After immigrating to Israel in 1990, Twersky became the head of the Torat Moshe Yeshiva, one of the first in the country established to cater to post-high school students from English-speaking countries. He is survived by his wife Miriam, five children and 10 grandchildren.
RABBI KALMAN LEVINE
Born Cary William Levine, the 50-year-old had dedicated his life to the land and people of Israel, said his brother-in-law, Jonathan Bein.
"There are people who, once they get there, their ethic is to never leave the land of Israel. He was one of those people," said Bein, who is married to Levine's sister, Shelly Levine, of Boulder, Colorado.
"He was a very peaceful, sweet guy - guileless, learned," Bein said. "Israel was his calling."
A native of Kansas City, Missouri, Levine attended the University of Southern California, where he studied the Torah and Talmud. He left in his 20s for Israel, where most recently he was teaching at a Jerusalem seminary, Bein said.
Levine's son, Yerachmiel Levine, recalled his father's dedication to his religious studies. "He would study all day long and would return home at night only to learn more until he would fall asleep in his chair," the son said.
Levine is survived by his wife, nine children and five grandchildren."
RABBI ARYEH KUPINSKY
The Detroit area native moved to Israel with his family when he was 10 and worshipped frequently at the Jerusalem synagogue where he died.
The third of five siblings, the 43-year-old Kupinsky was a "very religious man," said Esther Schwartz, a former neighbor in Oak Park, a Detroit suburb.
Schwartz said her son, who lives in Israel, emailed her about his slaying.
"All morning I couldn't stop crying," the 64-year-old said. "It shook us all up. This was a child we knew. He got married and had his own family. It's shocking, senseless and useless."
Kupinsky is survived by his wife and five children.
AVRAHAM SHMUEL GOLDBERG
The 68-year-old native of Liverpool, England, immigrated to Israel in 1993, and was a near daily participant in morning prayers at the synagogue where he died.
David Osborne, a friend who was near the synagogue when it was attacked, said Goldberg was "the most wonderful person you could meet."
He is survived by his wife, six children and grandchildren.
GHASSAN ABU JAMAL
The 27-year-old Palestinian was a resident of the Jabal Mukaber neighborhood of east Jerusalem, and worked at a clothing shop in a Jewish area of the city. Married and the father of two, he is not known to have been affiliated with any Palestinian militant group and had never been arrested.
ODAY ABU JAMAL
Ghassan's 21-year-old cousin, also a resident of Jabal Mukaber, worked as an interior decorator. He was not married, and like his cousin, had no known affiliations with Palestinian militant groups, nor had he been arrested.
Associated Press writers Karen Williams in New York, Mark Pratt in Boston, Bill Draper in Kansas City, P. Solomon Banda in Denver and Corey Williams in Detroit contributed to this report.
Also on AOL.com:
Obama gives a grim warning about Ebola
Woman turns up 10 years after she kidnapped her daughter
PETA accused of stealing, killing pet dog