The National Security Council ranks traveling to Turkey at a combined level 3 to 4, which is almost the highest level of warning. Istanbul is ranked 4, with the rest of Turkey ranked 3.
“In light of the escalation in Iranian intentions to harm Israelis in Turkey, with an emphasis on Istanbul, the National Security Council is calling on Israelis staying in Istanbul to leave the city as soon as possible. There is a moderate threat warning for the rest of Turkey, and it is recommended that Israelis also avoid travel that is not essential to the rest of Turkey.”