Here is what is known about the attempted attack on flydubai flight FZ1073, and what investigators are still working out.

What happened: On Wednesday, the co-pilot of the Dubai to Tel Aviv flight stabbed Captain Smit Machchhar and tried to take control of the plane. The jet plunged nearly 14,000 feet in under 30 seconds.

How it was stopped: The injured Indian pilot managed to open the cockpit door. Passengers and crew then overpowered the attacker. Two off-duty flydubai pilots on board helped land the plane safely in Tabuk, Saudi Arabia.

The hero: Machchhar was hailed as a hero by Prime Minister Narendra Modi and Israeli Prime Minister Benjamin Netanyahu. US President Donald Trump also praised him. All 174 people on board survived.

Where the probe stands: The attacker is being investigated in Saudi Arabia. Netanyahu said it was too early to say if Iran was involved, adding Israel would get to the root of it. Trump suggested early signs point to Iran and warned of retaliation.

Why it matters: The incident has raised questions about cockpit security and added to regional tensions, with the US sending more forces to the Middle East.