Governor of Turkish city Edirne said it was unjust for Turkey to invest in Jewish places of worship if Israel was infringing on Muslim holy sites in Jerusalem.
The bitter controversy over the need for the Turkish government to apologize for a massacre of citizens 76 years ago offers Israel a cautionary tale.
86% of Turks have negative view of Israel, according to Pew Research Center poll.
Turkey, once a safe haven for Jews, now outranks Iran in harboring anti-Semitic sentiment.
Turkey was once Israel's closest regional ally in the region, but former Prime Minister Recep Tayyip Erdogan has been a strident critic of its treatment of the Palestinians.
But open letter also objects to effort to hold Turkey's Jewish community responsible for conflict in the Strip.
Facebook status demanding it be changed to 'black coffee' gets nearly 10,000 likes.
Turkey will need Egypt's cooperation to play a role in the rehabilitation of Gaza, but al-Sissi's distaste for Erdogan's ties with Hamas is getting in the way.
Israel brushes off activists' campaign, saying, ' They have got nothing to do with human rights or humanitarian assistance. They are interested in pursuing conflict.'
IHH to sail for Gaza with new flotilla under the slogan ‘Let us be the medicine for Gaza.’