A Delta Airlines flight from Barcelona to Boston makes an emergency landing in Porto after smoke appears in the cabin

The Delta Airlines flight took off from Barcelona on Sunday afternoon. Flight DL251 was supposed to terminate in Boston, USA. There were 296 people on board. While the plane was in the Atlantic, smoke appeared in the cabin.

The Airbus A330 crew decided to return to Sá Carneiro Airport in Porto. A second threat level has been declared in the port. Rescue teams were on standby and waiting for the plane to make an emergency landing.

According to the Porto District Emergency Operations Command, there were approximately 60 officers at the scene. More forces were mobilized but later withdrawn.

At least 14 passengers needed medical attention after landing. They got smoke poisoning. Four people were taken to hospital. The remaining 282 people were unharmed.

Initial findings by Portuguese media indicate that the smoke appeared as a result of a "technical problem". However, no details were provided.

According to Airlive.net, Delta Air Lines flight DL251 was operated by an 11-year-old Airbus.