“What we experienced yesterday was terror. From what we know, the accused Stephan B. aimed to carry out a massacre in the synagogue,” said federal prosecutor Peter Frank.

Two people were shot dead in the eastern German city of Halle, Saxony-Anhalt, on Wednesday, with a synagogue and a kebab shop among the targets. The suspect, identified by media as 27-year-old German Stephan Balliet, filmed the assault and streamed it online.

The victims, a man and a woman, were apparently chosen at random when the assailant failed to gain access to the temple he had besieged with gunfire and homemade explosives, as the frightened congregation barricaded itself inside.

The rampage was streamed live for 35 minutes on Twitch, and eventually seen by some 2,200 people, the online platform said, in a chilling reminder of the mosque attack in Christchurch, New Zealand in March which was also played out online in real-time.

Police subsequently captured the Halle suspect after a gun battle that left him wounded.

German President Frank-Walter Steinmeier, joined by Israeli ambassador Jeremy Issacharoff and local officials, laid flowers outside the synagogue on Thursday before meeting with Jewish community leaders inside.

Steinmeier said Germany had a duty to protect Jews on its soil.

“It must be clear that the state takes responsibility for Jewish life, for the security of Jewish life in Germany,” he said.

“We must protect Jewish life.”

Chancellor Angela Merkel joined a solidarity vigil at a historic synagogue in central Berlin late Wednesday, and firmly condemned the anti-Semitic rampage.

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• 'A total Loser': Gunman's video reveals anti-Semitism, callous killings and blundering attempts at mass murder
• Fears over Germany's violent far-right grow after Halle attack

Angela Merkel at the New Synagogue in Berlin on Wednesday evening. Photo: DPA

But Jewish leaders said that words were not enough, with Israeli Prime Minister Benjamin Netanyahu joining calls for German authorities to “act resolutely against the phenomenon of anti-Semitism”.

The head of the Central Council of Jews in Germany ripped into the authorities for failing to provide adequate security on the holiest day of the Jewish calendar.

“It is scandalous that the synagogue in Halle is not protected by police on a holiday like Yom Kippur,” said Josef Schuster.

“This negligence has now been bitterly repaid.”

Ronald Lauder, who heads the World Jewish Congress, also stressed the far-right threat. “The fact that, 75 years after the Holocaust, such groups are gaining influence in Germany speaks volumes.”

Germany has taken pride in the rebirth of Jewish life since the Nazis' World War II slaughter of six million Jews across Europe. The community has grown to about 225,000 thanks in large part to an influx from the ex-Soviet Union after the fall of the Berlin Wall.

'We made it out'

In a copy of a 35-minute video obtained by AFP the gunman filmed himself launching into a diatribe against women and Jews and denying the Holocaust, before carrying out the attack.

The video's authenticity has been confirmed by the SITE monitoring group but not by police.

READ ALSO: Halle gunman posted a video on online platform Twitch

The gunman also published an anti-Semitic “manifesto” online more than a week ago, according to SITE director Rita Katz, who said the document showed pictures of the weapons and ammunition he used.

In the video, he was seen trying to force open the synagogue door before shooting dead a female passer-by. He then tried unsuccessfully to blast open the gate of the Jewish cemetery with explosives.

The man was later seen shooting at a patron of a kebab shop about 600 metres (yards) away from the synagogue.

Jewish community leader Max Privorotzki, who was in the Halle synagogue, told the Stuttgarter Zeitung of the harrowing minutes as the site came under assault.

“We saw through the camera of our synagogue that a heavily armed perpetrator wearing a steel helmet and rifle was trying to shoot open our door.”

Karamba Diaby, Social Democrats MP in Halle, lays tributes for the victims in front of the synagogue. Photo: DPA

Between 70 and 80 people were in the synagogue then.

“We barricaded our doors from inside and waited for the police,” he said. “Then we carried on with our service.”

 'Like a professional'

Among those in the synagogue were 10 Americans, as well as several Israelis, who had turned up in Halle especially to join the small local population in celebrating Yom Kippur.

“We've made it out with our lives, in health and amazing spirits,” wrote Rebecca Blady, a Jewish American community leader, who was in the synagogue.

An employee at the kebab shop, Rifat Tekin, meanwhile described the gunman as “calm like a professional”.

“Maybe he has done this many times. Like me making a kebab, he's doing this – like a professional.”

A video shows the gunman opening fire. Photo: DPA

Bild daily spoke to relatives and neighbours who described Balliet as a loner and computer junkie who lived with his mother.

Anti-terrorist prosecutors confirmed on Wednesday they were taking over the probe. Investigators were combing his online traffic for clues to possible links to far-right networks.

Wednesday's shootings came three months after the assassination-style murder of local pro-migrant politician Walter Lübcke in the western city of Kassel, allegedly by a known neo-Nazi.

Lübcke's killing has deeply shaken Germany, raising questions about whether it has failed to take seriously a rising threat from right-wing extremists.

Seehofer last month warned of the rising danger of the violent far right, calling it “as big a threat as radical Islamism”.