Turkish President Recep Tayyip Erdogan on Sunday sent a letter to his Israeli counterpart, President Reuven Rivlin, in which he expressed his condolences for the death of three Israelis in the terror attack Saturday in Istanbul.

“I was greatly saddened to learn that unfortunately, 3 Israeli citizens also lost their lives and 10 Israeli citizens were wounded at the ignoble terror attack which happened yesterday in Istanbul,” Erdogan wrote.

“With yesterday’s heinous attack, it has again been seen most clearly that it is an absolute necessity for the international community to conduct a joint, united and determined fight against terrorism, which targets the whole of humanity and fundamental human values and constitutes a crime against humanity.

The courage and will displayed by our people against the actions of terrorist organizations which aim to instill fear, give us strength in this struggle,” wrote Erdogan.

“I would like to convey my deepest condolences to the people of Israel and to the families of Israeli citizens who lost their lives in this treacherous attack which happened in Istanbul, where they were visiting our country to get better acquainted with our culture, and wish a speedy recovery to the injured,” he concluded.

On Saturday, hours after the attack, Turkish Prime Minister Ahmet Davutoglu sent a letter of condolences to Prime Minister Binyamin Netanyahu.

“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,” the Turkish Prime Minister wrote to Netanyahu.

“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,” he added.

Meanwhile, Israel’s government on Sunday warned against travel to Turkey in the wake of the Istanbul attack.

The country’s anti-terrorism office raised its threat assessment and “recommends avoiding visits to Turkey,” it said in a statement.

“Yesterday’s deadly attack in Istanbul, in which a group of Israeli tourists was hit, underscores the threat against tourist targets throughout Turkey.”

Tens of thousands of Israelis visit nearby Turkey each year despite strained diplomatic relations between the two countries.