She and her husband Jeremy, two Jewish orthodox community leaders who recently moved to Germany, had eagerly agreed to celebrate in the "shul" or synagogue there, which rarely has enough worshippers to fill its space on high holidays.

In the event, they ended up being survivors and witnesses of a day of extrordinary violence.

With the pair came around twenty young practising Jews from the US, Germany and Israel to "bring some extra energy to the prayers," she told AFP, adding that she also brought with her sacred objects and photocopies of religious texts and songs.

To reach the temple, she had to make her way through the spartan blocks of flats characteristic of the city in the former communist East.

"We had incredible prayers, full of beautiful songs and even dance, until we suddenly heard a loud bang outside," Blady said.

Besieged

"We were in the middle of the services, in particular the part where we were reading the Torah" when they heard the attacker.

"It sounded like it could have been a gunshot, maybe an explosion. We really had no idea."

Some of the congregation ran to the display screens connected to the outdoor security cameras.

After a few moments of silence, the sounds of blasts came again.

Over anxious minutes -- police say between around 12:03 and 12:11 pm, when the first officers arrived -- the man outside tried to force the door with explosives and a shotgun.

He was later identified as a 27-year-old German, who filmed his attempt to storm the synagogue -- opening the video with an antisemitic diatribe.

"Go somewhere away from the windows, where you can be safe, because they're shooting at us!", the watchers said.

The roughly 50 people gathered inside fled upstairs where it seemed safer, or into a back room of the building.

Most didn't even have phones on them to contact the outside world, leaving them to wait silently while imagining the worst.

"It was a very scary thing... just a chilling experience," Blady said.

But after 20 minutes, the group were reached by police, who decided to lock down the synagogue, keeping the worshippers inside under police protection.

Outside lay the body of a female passer-by shot by the attacker, who had then fled to a nearby kebab shop and killed another man.

Prayers

Blady decided to keep her group's mind off the threatening circumstances with prayer, keeping them going for two full hours.

Only at five pm were the congregation evacuated to a nearby hospital.

They "prayed neilah here to end the day with extra fervour and heard the sound of the shofar" (a religious instrument made from a ram's horn), as well as breaking their fast, Blady said.

After that, they were brought to safety in a hotel under police watch.

"God counted us all there, one by one, as deserving of life," Blady said.

"This kind of news, it's not new and it's not unique to Germany any more... it can happen now, anywhere in the world."