Auction house Sotheby's Dubai has unveiled a diamond that's literally from out of this world.

Sotheby's calls the 555.55-carat black diamond — believed to have come from outer space — "The Enigma." The rare gem was shown off on Monday to journalists as part of a tour in Dubai and Los Angeles before it is due to be auctioned off in February in London.

An Israeli hospital has said preliminary research indicates a fourth dose of the coronavirus vaccine provides only limited defense against the omicron variant that is raging around the world.

Sheba Hospital last month began administering a fourth vaccine to more than 270 medical workers — 154 who received a Pfizer-BioNtech vaccine and 120 others who received Moderna's. All had previously been vaccinated three times with the Pfizer-BioNtech vaccine.

Satellite photos obtained by The Associated Press on Tuesday appear to show the aftermath of a fatal attack on an oil facility in the capital of the United Arab Emirates claimed by Yemen's Houthi rebels.

The images by Planet Labs PBC analyzed by the AP show smoke rising over an Abu Dhabi National Oil Co. fuel depot in the Mussafah neighborhood of Abu Dhabi on Monday. Another image taken shortly after appears to show scorch marks and white fire-suppressing foam deployed on the grounds of the depot.

Japan's government is preparing social restrictions in Tokyo and other regions as the omicron variant of the coronavirus infects more people.

Japan has never had a lockdown during the pandemic but has focused instead on asking restaurants and bars to close early. Crowds are back in many parts of Japan, with people packing stores and events, while COVID-19 cases jump.

South Korea's leader arrived in Saudi Arabia on Tuesday, where he was greeted in Riyadh by the kingdom's crown prince and an honor guard marching band.

It was the second stop on a Mideast tour by South Korean President Moon Jae-in and his wife, who were greeted on the tarmac by Crown Prince Mohammed bin Salman. All were masked and President Moon did not shake hands with the prince, in line with coronavirus social distancing practices.

British Prime Minister Boris Johnson on Tuesday denied misleading Parliament about lockdown-breaching parties, as senior government ministers said he would have to resign if he was proven to have lied.

Former Johnson aide Dominic Cummings has said he is willing to swear under oath that the prime minister was warned in advance that a May 2020 garden party for Downing Street staff would break coronavirus restrictions.

North Korea said Tuesday it had conducted a test-firing of "tactical guided missiles," a day after South Korea's military detected the North launching two ballistic missiles into the sea.

Monday's test was North Korea's fourth round of missile launches this month and the second since its Foreign Ministry warned of stronger and more explicit action after the Biden administration last week imposed fresh sanctions over the North's continued weapons displays.

Dozens of Lebanese, including families of Beirut port explosion victims, rallied Monday outside the Justice Palace in support of Judge Tarek Bitar after he was forced to suspend his work as a lead investigator into the Beirut port blast.

Protesters held portraits of their loved ones who died in the explosion.

Japanese Prime Minister Fumio Kishida told parliament on Monday that fighting the pandemic and strengthening defense are his government's top priorities.

Kishida delivered a speech opening this year's parliamentary session hours after North Korea test-fired two possible ballistic missiles — its fourth tests this month.

China is showing no signs of slowing its demand for American lobster this year despite disruption to the supply chain and international trade caused by the coronavirus pandemic.

Chinese demand for the crustaceans grew dramatically during the 2010s in part because of the expansion of the country's middle class. The lobsters are especially sought after in winter because they are a popular delicacy on Chinese New Year, which is Feb. 1 this year.