Irem Aktas, a member of Turkey's ruling Justice and Development Party, posted a tweet today, reading "I wish that the wounded Israeli tourists were dead."
She deleted the account shortly after posting it, but not in time to prevent a strong backlash over her lack of sympathy.
Aktas, who is responsible for the party's digital communications and holds the party's Women's Media & Publicity Chair, also wrote "when Israel was attacking your Muslim brothers, why didn't you say anything."
A spokesperson for the Israeli Foreign Ministry said, "We are looking into the issue with the Turkish Foreign Ministry. If it is correct, then it is clearly a disgusting and shocking statement, and we expect an apology and a renunciation."
Health Minister Mehmet Müezzinoğlu offered a relatively kinder message, tweeting: "Even though they are foreigners, they are human beings as well."
Turkish Prime Minister Ahmet Davutoğlu sent a personal message to Israeli Prime Minister Binyamin Netanyahu, saying: "Today's attack in Istanbul has shown us once again that the international community as a whole should act in a resolute manner against the ignoble objectives of terrorist organizations.
"I would like to convey my condolences to the families of the Israeli citizens who lost their lives in the heinous attack which happened in Istanbul and to the people of Israel, and wish a speedy recovery to the wounded."
Three Israelis were killed in today's (Saturday) attack, while another 11 were wounded.