The website where the suspected Pittsburgh synagogue gunman posted anti-Semitic views says it was “working around the clock” to stay online after being cut off by payment processors and forced to switch web hosts.

Robert Bowers posted on Gab.com just hours before allegedly murdering 11 people on Saturday in the deadliest attack ever on the Jewish community in the United States.

In his post, the 46-year-old Pittsburgh resident claimed a non-profit organisation that helps Jewish refugees relocate to the United States was helping to kill “my people”.

Robert Gregory Bowers is charged with killing eight men and three women inside the Tree of Life Synagogue on Saturday.

A pair of brothers and a married couple were among his victims, the oldest of whom was a 97 year old who attended the synagogue with her daughter, Karl Williams, chief medical examiner for Allegheny County, told reporters on Monday morning (AEST).

Dr Williams listed the 11 victims as: Joyce Fienberg, 75; Richard Gottfried, 65, Rose Mallinger, 97; Jerry Rabinowitz, 66; Cecil Rosenthal, 59, and his brother David Rosenthal, 54; married couple Bernice Simon, 84, and Sylvan Simon, 86; Daniel Stein, 71; Melvin Wax, 88; and Irving Younger, 69.

PayPal banned the Gab website from using its money-sending services shortly after the massacre.

Gab said it received notice it would be blocked by another payments website, Stripe, and had switched to a new web-hosting service after Joyent warned it would cut it off.

Gab did not say who the new web host was.

“Working around the clock to see to it that Gab.com stays online,” the company posted on Twitter on Sunday: “FREE SPEECH WILL ALWAYS WIN.”

The alleged Pittsburgh shooter vented on Gab before killing 11 people. Photo: AP

Founded in 2016 by conservative Andrew Torba, Gab bills itself as the “free speech” alternative to Twitter and Facebook and has become a popular place to post content unwelcome or prohibited on other platforms.

Notable users include right-wing provocateur Milo Yiannopoulos and Andrew Anglin, the founder of the neo-Nazi Daily Stormer website, as well as media personalities Alex Jones and Carl Benjamin.

The free website charges for access to additional features and also raises money on the crowdfunding website StartEngine.

Mr Torba did not respond to a request from Reuters for comment on Sunday.

Utsav Sanduja, Gab’s former chief operating officer, said the company and its mission will survive “guilt by association” and could do more fundraising through cryptocurrencies in order to bypass tech companies.

“We created Gab for the purpose of letting off steam not to kill. That was not our intention,” he said.

In earlier statements the website said it was it was cooperating with law enforcement authorities and described the moves by PayPal and others as acts of “direct collusion between big tech giants”.

It also called on US President Donald Trump to act. 

-AAP