An Israeli tourist was among those injured in Monday’s terror attack on a crowded Christmas market in central Berlin, in which 12 people were killed and 50 others were injured when a tractor-trailer plowed into the market.

The Israeli Foreign Ministry confirmed Tuesday that an Israeli tourist in his 60s was among those injured in the attack, while the whereabouts of his wife were still unknown. An official from the ministry said the man had undergone surgery and was in stable condition.

“Israel condemns what appears to be a terror attack in Germany,” Israeli Prime Minister Benjamin Netanyahu told reporters Tuesday. “We send our condolences to the families of the victims and of course to the German government and a speedy recovery to the injured, including an Israeli citizen.”

German Chancellor Angela Merkel said Tuesday that “we must assume at the current time that it was a terrorist attack.”

Authorities initially believed the attack was committed by a 23-year-old man from either Pakistan or Afghanistan, who came to Germany as a refugee and was apprehended near the scene of the attack. But police have yet to officially confirm that the man was the tractor-trailer’s driver.

“I know that it would be particularly difficult for all of us to bear if it is confirmed that this deed was carried out by a person who sought protection and asylum in Germany,” said Merkel.

Israel’s President Reuven Rivlin expressed his deepest sympathies to Germany’s President Joachim Guack following the terror attack.

“At a time when I should rather be extending to you seasonal greetings and wishes for the New Year, I find myself once again sadly having to express my heartfelt condolences to you and all the German people following the terror attack in Berlin last night,” President Rivlin said by phone. “Even at such times of tragedy and heartbreak we strengthen our resolve to stand united and firm against terrorism…Israel stands hand in hand with Germany in the fight against hatred, extremism, and all forms of terror. Fighting terror is the task of all the free world, this is a wake-up call. On behalf of all the citizens of the state of Israel, I extend my deepest sympathies to the bereaved families, and send our wishes for a speedy and full recovery to the injured. May this next year see an end to terror and hatred.”