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2. The plane disappeared from radar at 1:30 a.m. local time over the waters between Malaysia and Vietnam, 85 miles north of the Malaysian city of Kuala Terengganu.

3. There were 239 people on board: 227 passengers and 12 crew members.

Relatives of missing passengers make their way through a crowd of reporters a hotel in Beijing.

4. The nationalities of the passengers on board included:

• 152 Chinese passengers (including an infant), • 38 Malaysians, • 12 Indonesians, • six Australians, • five Indians, • three Americans (including an infant), • three French, two Canadians, • two New Zealanders, • two Ukrainians, • one Dutch, • one Italian, • one Russian, • one Taiwanese, • and one Austrian.

5. It was later reported that the Austrian and Italian passengers had their passports stolen and were not on the plane.

CNN released this photo showing the two consecutive tickets purchased by the two passengers with stolen passports.

6. The passengers with the stolen passports reportedly purchased their tickets together.

7. At a press conference on Monday, Malaysia Airlines officials said that Interpol was currently investigating four passengers.

Malaysia Airlines Chief Executive Officer Ahmad Jauhari Yahya and Department of Civil Aviation Director General Datuk Azharuddin Abdul Rahman speak at a news conference at the Kuala Lumpur International Airport in Sepang.

8. Malaysian authorities have ruled nothing out, including terrorism, hijacking, pilot suicide, and mechanical failure.

U.S. officials told NBC News on Saturday they were investigating terrorism concerns. Officials have cautioned that no link to terrorism had been discovered so far.

9. The FBI and Interpol, along with a joint team of Chinese and Malaysian officials, are looking into the possibility of a botched hijacking.

A joint working group sent by the Chinese government to Malaysia checks in at an airport in Beijing.

10. Interpol released a statement concerning the two men with stolen passports who were en route to Europe via Beijing.

The Austrian and Italian passports were added to INTERPOL’s SLTD database after their theft in Thailand in 2012 and 2013 respectively. INTERPOL is also conducting checks on all other passports used to board flight MH 370 which may have been reported stolen.

No checks of the stolen Austrian and Italian passports were made by any country between the time they were entered into INTERPOL’s database and the departure of flight MH 370. At this time, INTERPOL is therefore unable to determine on how many other occasions these passports were used to board flights or cross borders.

INTERPOL is currently in contact with its National Central Bureaus in the involved countries to determine the true identities of the passengers who used these stolen passports to board the missing Malaysia Airlines flight.

11. The plane completely vanished from radar one minute before it entered Vietnam’s air traffic space, according to Lt. Gen. Vo Van Tuan, deputy chief of staff of the Vietnamese army.

A Vietnamese official joins the search party at a military airport in Vietnam’s Ho Chi Minh City.

12. The Vietnamese media originally reported the plane crashed south of Phu Quoc island. But it was later reported that no wreckage had been discovered.

Vietnamese military personnel onboard an aircraft off the coast of Vietnam’s Tho Chu Island.

13. Vietnam, Malaysia, China, Singapore, and the Philippines are all working together to find the missing plane, along with The U.S. 7th Fleet’s USS Pinckney.

Vietnamese military personnel looking out of a helicopter during a search-and-rescue mission off Vietnam’s Tho Chu Island.

14. A Singaporean search plane discovered a “strange object” on Sunday, only to discover it was not debris from the plane.

Vietnamese military personnel reviewing MH370’s original flight path.

15. There were no distress calls or reported problems before MH370 vanished. And according to weather reports, there were no significant storms in the area.

The Vietnam Air Force during a search and rescue mission off Vietnam’s Tho Chu Island.

16. Military radar signals show that the flight may have turned back before vanishing.

The Vietnam Air Force during a search and rescue mission off Vietnam’s Tho Chu Island.

17. So far, any objects or oil spills found by search teams have not been connected to Flight MH370.

This view of an oil spill is seen from the window of an aircraft belonging to the Vietnamese Air Force, off the coast of Tho Chu Island.

18. As of Monday, the leading theory on the flight’s disappearance is that the plane disintegrated mid-flight.

“Pray for MH370” is written in candles during a vigil held by ethnic Malaysian-Chinese for the passengers of Malaysia Airlines MH370 near Independence Square in Kuala Lumpur.

19. In 2005, Malaysia Airlines Flight 124, also a Boeing 777-200, departed Perth for Kuala Lumpur and ran into instrumentation issues, forcing the pilot to land the aircraft in Perth manually.

A giant screen in Beijing shows the number hours since Malaysia Airlines flight MH370 went missing.”

Source: Buzzfeed