"It’s hard to imagine a more violent and cynical crime than murder committed during a service of worship. We share the sorrow of those who lost their loved ones at Tree of Life Synagogue and wish a speedy recovery to the injured Pittsburgh Shooting," it tweeted.
The deadly attack took place on Saturday, when a gunman opened fire inside a synagogue, killing 11 people and injuring another six. He was wounded in a shootout with police before surrendering to security forces.
Authorities said they had charged the man and were treating the shooting as a hate crime. US President Donald Trump called it an act of anti-Semitism that will be confronted anywhere it appears.