The parking lot of Brazilian Rio's local airport Santos Dumont was closed on Thursday after an anonymous tip that a bomb was hidden in a car in the area, Xinhua reported.
Rio police's bomb squad officers swept the parking lot for hours, with the aid of sniffer dogs, but did not find any explosives.
According to airport administration agency Infraero, the investigation was necessary because the tip did not specify any details of the car in which the bomb might be.
The airport remained open during the search, but the traffic in the streets surrounding the parking lot was blocked for several hours.
It was the second bomb threat in Rio on Thursday. Earlier in the day, the bomb squad detonated an explosive device which has been left in the vicinities of a technical school in the Tijuca neighborhood.
The police said that the device was a homemade bomb, with an aluminum body, and could have caused injuries to people in a 15- meter radius.
"It was a crude simulation of a grenade, but could cause a grave injury or even death," said bomb squad inspector Edson Brito.