By Steve Holland, Rami Ayyub and Nidal al-Mughrabi

DAVOS, Switzerland/JERUSALEM/CAIRO, Jan 22 (Reuters) - The United States on Thursday announced plans for a "New Gaza" rebuilt from scratch to include residential towers, data centres and seaside resorts, part of President Donald Trump's push to advance an Israel-Hamas ceasefire shaken by repeated violations.

In the Gaza Strip, health officials said Israeli airstrikes on Thursday had killed five people in the enclave. There was no immediate Israeli comment on the violence, the latest to fray the October truce accord.

Jan 22 (Reuters) - Iraq's Supreme Judicial Council said on Thursday it would begin legal proceedings against Islamic State detainees transferred from Syria after the rapid collapse of Kurdish-led forces in northeast Syria triggered concerns over prison security.

The U.S. military said on Tuesday its forces had transferred 150 Islamic State detainees from Syria to Iraq and that the operation could eventually see up to 7,000 detainees moved out of Syria. It cited concerns over prison security after the military setbacks suffered by the Syrian Democratic Forces.

President Donald Trump said a US "armada" was heading toward the Gulf and that Washington was watching Iran closely, even after downplaying the prospect of imminent military action and saying Tehran appeared interested in talks.

Trump has repeatedly left open the option of new military action against Iran after Washington backed and joined Israel's 12-day war in June aimed at degrading Iranian nuclear and ballistic missile programmes.

The prospect of immediate American action seemed to recede in recent days, with both sides insisting on giving diplomacy a chance.

GAZA, Jan 22 (Reuters) - As Israel moved the blocks marking its armistice line with Hamas deeper into one Gaza neighbourhood in December, it destroyed dozens of buildings and displaced Palestinians in violation of a U.S.-backed ceasefire deal, according to satellite imagery reviewed by Reuters and resident testimony.

DAVOS, Jan 22 (Reuters) - The Rafah crossing with Egypt, Gaza's main gateway, which has been largely shut during the Israel-Hamas war, will reopen next week, Palestinian technocratic committee leader Ali Shaath said on Thursday.

(Reporting by Steven Holland;Editing by Alison Williams)

The commander of Iran's Revolutionary Guards on Thursday warned Israel and the US against "miscalculations" in the wake of mass protests, saying the force had its "finger on the trigger".

US President Donald Trump has repeatedly left open the option of new military action against the Islamic republic after Washington backed and joined Israel's 12-day war in June.

By Steve Holland

DAVOS, Switzerland, Jan 22 (Reuters) - U.S. President Donald Trump will on Thursday launch his Board of Peace, originally intended to help end the devastating Gaza war but which he now sees having a wider role that Europe and some others fear will rival or undermine the United Nations.

Trump, who will chair the board, has invited dozens of other world leaders to join it and sees the grouping addressing other global challenges beyond Gaza, though he does not intend it as a replacement for the United Nations, he has said.

Young protesters shot in the back, shotgun pellets fired in a doctor's face, wounded people afraid to go to hospital: "Every family has been affected" by the deadly crackdown on Iran's recent wave of demonstrations, said one protester.

Speaking to AFP in Istanbul, this 45-year-old engineer who asked to be identified as Farhad -- not his real name -- was caught up in the mass protests that swept his home city of one million people just outside Tehran.

US President Donald Trump headed home from Davos on Thursday after unveiling his new "Board of Peace" and once again casting himself as a global peacemaker, despite widespread scepticism over a plan that aims to rewrite the world order.

Trump officials also unveiled ambitious plans for a "New Gaza" during the ceremony at the World Economic Forum, the US leader describing the devastated Palestinian territory as "great real estate".

Jan 21 (Reuters) - Russian President Vladimir Putin said on Wednesday he would meet on Thursday with U.S. envoys Steve Witkoff and Jared Kushner, who have been tasked with finding a solution to Russia's nearly four-year-old war with Ukraine.

Putin, quoted by Russian news agencies, said during a meeting of Russia's Security Council that he would discuss the possible use of frozen Russian assets with the U.S. envoys in connection with recovery work in regions affected by the war.