Four people were killed when a helicopter crashed in Tijuca National Park in Rio de Janeiro, including three Colombian tourists from one family and the pilot, firefighters and Colombia's consul general said.

The aircraft came down in dense vegetation on a steep hillside near Vista Chinesa, a high-altitude viewpoint in the park. Firefighters released images of the smoking wreckage and said the pilot and three women died in the post-crash fire. The difficult terrain complicated access to the site.

Diana Paez, Colombia's consul general in Rio de Janeiro, said the women belonged to a family group of six visiting the city to celebrate a girl's 15th birthday. Because the helicopter could carry only three passengers, the family had divided into two groups for separate flights.

The girl's grandmother, aunt and cousin were aboard the first flight and died. The teenager was due to travel later with her father and his partner, Paez said. The Colombian consulate assisted Brazilian authorities in identifying the victims, a process made difficult by the condition of the bodies.

The initial report did not identify the pilot, the helicopter operator or the aircraft model. It also did not give a suspected cause, weather conditions or any communication between the pilot and air-traffic authorities before the crash. Those matters would require an aviation investigation.

Tijuca National Park is a mountainous urban forest, and helicopter sightseeing flights are marketed to visitors seeking aerial views of Rio and its coastline. Vista Chinesa is known for panoramic views from within the forest. The popularity of such flights provides context for the family's trip but does not indicate what caused this aircraft to go down.

The crash followed another fatal helicopter incident over Rio in June, when two aircraft collided and six people died. The supplied account did not suggest that the events shared an operator or cause.

Rio Mayor Eduardo Cavaliere said he had asked Brazil's National Civil Aviation Agency to increase monitoring immediately to ensure helicopter-flight safety. His request signalled official concern, but no specific regulatory violation had been announced in connection with the August 8 crash.

For investigators, the central unanswered questions include the helicopter's maintenance history, the pilot's actions, flight conditions and whether any technical failure occurred. The verified facts establish four deaths, the family relationship among the Colombian passengers and the remote crash location. Until aviation authorities issue findings, responsibility and cause remain undetermined. Identification assistance from the Colombian consulate addressed the victims' identities, not the aviation cause. The wreckage was still smoking when firefighters reached it.