Bogota, Colombia – Search and rescue teams in Colombia are searching for a passenger plane carrying 15 passengers that went missing near the eastern border with Venezuela.

Two crew members were among the passengers, which included a Colombian congressional representative and a candidate running in the upcoming elections, according to local officials and media reports.

It remains unclear what caused the disappearance, but local Air Traffic Control sources say the plane’s flight history shows a sudden altitude drop 11 minutes before it was expected to land in Ocana.

The flight, operated by government-run commercial airline Satena, was en route from Cucuta to Ocana, two cities in the North Santander department bordering Venezuela, when it left radar coverage.

“The Accident Investigation Directorate of @AerocivilCol reports that it is gathering information regarding the loss of communication from aircraft HK4709, which was flying the Cucuta-Ocaña route with 13 passengers and 2 crew members,” wrote Maria Fernanda Rojas, Colombia’s minister of transport, in a post on X.

“The corresponding protocols have been activated, and we have already initiated PMU,” added Rojas, referring to the “Unified Command Post” set up to respond to emergencies.

The plane disappeared in a remote region characterised by dense jungle, complicating search-and-rescue efforts.

Among the passengers was Diogenes Quintero, a lower house lawmaker who holds a seat specially reserved for conflict victims. He was accompanied by ​​Carlos Salcedo Salazar, a candidate running for the same seat.

A local government official, who requested anonymity since they were not authorised to speak to the press, told Al Jazeera that authorities suspected that the plane had been affected by adverse weather conditions.

Drug trade

The Catatumbo region is also an active conflict zone and is home to the world’s largest cultivations of coca, the plant which produces the raw ingredient used to make cocaine.

Both the drug trade and the region’s strategic location on the Venezuelan border have made it a historic hotbed for armed conflict between rebel groups.

In January last year, violent clashes between the National Liberation Army (ELN) and Frente 33, a dissident group of the demobilised FARC fighters, displaced more than 50,000 people in the region.

The route from Cucuta to Ocana began operating only in June last year, marking an important milestone for a region that has historically had poor road connections to major cities.