Turkish Prime Minister Tayyip Erdogan saw "grounds for war" with Israel last year after a deadly raid on a Turkish ship headed for Gaza, according to a transcript of a recent interview.

State news agency Anatolia released late on Sunday what it said was an original Turkish-language transcript of an interview Erdogan gave to Al-Jazeera television last week. It included elements not broadcast as well as original wording for sensitive comments that had been transmitted only in Arabic translation.

Among previously unpublished comments, Erdogan said: "The attack that took place in international waters did not comply with any international law. In fact, it was grounds for war. However, befitting Turkey's greatness, we decided to act with patience."

The transcript in Turkish, apparently provided by Erdogan's office, also gave the following account of the prime minister's response to a question on what Turkey would do to ensure free passage for its ships in the Mediterranean.

“Right now, without a doubt, the primary duty of Turkish navy ships is to protect its own ships," Erdogan said.

"This is the first step. And we have humanitarian aid that we want to carry there. This humanitarian aid will not be attacked any more, as it was the case with Mavi Marmara."

Turkey has downgraded diplomatic ties with Israel and halted defence-related trade after the Jewish state's confirmation last week that it would not apologise for the May 2010 raid on the Mavi Marmara in which nine Turks were killed.

Turkey and Israel had tried to mend fences before the publication of a UN report two weeks ago, which deemed the blockade of the Gaza Strip a legal means to stem the flow of arms to Palestinians.

Israel has said it will continue the blockade but wants to ease tensions with its former ally.

The prospect of a showdown at sea with Turkey, a NATO power and fellow ally of the United States, rattled Israelis already on edge over political upheaval in the Arab world and Iran's nuclear programme. Washington has appealed for restraint.

Erdogan, seeking to expand Turkey's regional influence, will travel to Cairo on Monday as part of a tour of three Arab countries likely to be scrutinised by Israel, whose once warm ties with both Muslim states have been shaken.