The indictment alleges that after entering the building, Bowers, armed with multiple firearms, opened fire, killing and injuring worshippers, as well as injuring multiple responding public safety officers.
Rabbi Jeffrey Myers of the Tree of Life/Or L'Simcha Congregation stands across the street from the synagogue in Pittsburgh, October 29, 2018. He told the judge that he understood the charges filed against him and that some could result in his execution.
Officials say Bowers was armed with three Glock.357-caliber handguns and an AR-15 semi-automatic rifle, when he burst into what had been quiet Sabbath services and fired at congregants.
Flowers surround Stars of David on October 31, 2018, part of a makeshift memorial outside the Tree of Life Synagogue to the 11 people killed during worship services Saturday in Pittsburgh. The Justice Department has said federal prosecutors in Pittsburgh have begun the process of seeking a possible death sentence in the case; such decisions are made by the attorney general after a review by federal lawyers who specialise in capital cases.
This courtroom sketch depicts Robert Bowers as he appeared in a wheelchair in federal court on Monday.
The controversial president - whose visit was met by large protests from Jews and non-Jews alike who argued he'd given license to anti-Semites like the one who carried out Saturday's attack - visited the shaken Jewish community of Pittsburgh's Squirrel Hill.
Fienberg's sons, Anthony, of Paris, and Howard, of Vienna, Virginia, said she spent five years caring for their father as he battled cancer, then, after his death a few years ago, devoted more of her time and energy to Tree of Life. The dead include a set of brothers, a husband and wife, professors, dentists and a physician. Jerry Rabinowitz, Daniel Stein and Cecil and David Rosenthal who were among 11 people killed in the shooting rampage at the Tree of Life synagogue Saturday.
After the mass shooting, President Donald Trump, who visited the Tree of Life synagogue and met with its rabbi this week, called to "stiffen up our laws in terms of the death penalty", CBS News reported.
Funerals were held for three more victims on Thursday: Bernice and Sylvan Simon and Dr. Richard Gottfried.
"She was an engaging, elegant, and warm person", the center said on Facebook. The oldest victim, 97-year-old Rose Mallinger, will be honoured at the last service Friday.
Bowers, a truck driver, remained jailed without bail ahead of a preliminary hearing scheduled for Thursday.