The US ambassador to Germany Richard Grenell said there were 10 Americans inside a Halle synagogue during a deadly shooting in front of the building Wednesday, adding that all were uninjured.

“We have identified 10 Americans who were inside the synagogue at the time of the attack, all are safe and unharmed,” he tweeted.

Witnesses said the gunman had tried to gain access to the temple by shooting at the door but the congregation managed to barricade itself inside until the assailant fled.