A violent incident aboard a Flydubai flight from Dubai to Tel Aviv has prompted Portugal's foreign ministry to call for a full investigation, after the aircraft reportedly plunged more than 5,000 metres in under two minutes before making an emergency landing in Saudi Arabia.

Foreign minister Paulo Rangel praised what he called the courage and composure of the pilot and passengers, whose intervention he said prevented what could have been a tragedy involving 180 people. In a statement on social media, he stressed that the suspected terrorist dimension of the attack was alarming and needed to be thoroughly probed.

According to reporting cited by Lusa and the Israeli newspaper Haaretz, a group of passengers subdued the co-pilot, who is understood to be an Omani national. Videos circulating online showed the alleged attacker and the victim on the cabin floor, covered in blood. The identity of the co-pilot and his current condition have not been disclosed. Captain Smit Machchhar, who has been widely praised for handling the emergency, is in stable condition, according to the Indian Embassy in Saudi Arabia.

The plane diverted to Tabuk airport, where the Israeli passengers were transferred to another Flydubai aircraft that completed the journey to Tel Aviv. Israel's prime minister, Benjamin Netanyahu, was waiting for them on arrival. Israeli intelligence and security personnel subsequently travelled to Saudi Arabia to assist with the investigation, according to an unnamed regional source.

Descriptions of what happened differ sharply. The UAE's General Civil Aviation Authority called it a "security incident" in which some crew members were injured, and said it is reviewing operational and security aspects in coordination with Israel. Flydubai described a "disturbance in the cockpit". Israel's defence minister went much further, calling it a "jihadist terrorist attack attempt" thwarted by the heroism of passengers.

Why it matters for travellers: this is a rare but sobering reminder of how quickly an onboard situation can escalate, and of the gap that can open between an airline's careful official wording and a government's characterisation of the same event. Anyone flying the Dubai–Tel Aviv route, or connecting through Gulf hubs, will want to watch how the investigation lands — particularly what it means for cockpit security procedures and passenger screening on regional routes. It may also affect confidence in rapid-divert options: the successful emergency landing at Tabuk shows how contingency plans work in practice, but also how dependent they are on airports in third countries being ready to receive a stricken aircraft.

For now, no airline has announced route changes, and the UAE authority says its investigation continues. Travellers with upcoming Flydubai bookings should expect normal operations, but it is worth monitoring official updates rather than social media clips, which have so far driven much of the speculation around the case.