A Turkish Airlines passenger plane flying from Istanbul to Basel turned back over Bulgarian air space Friday after a bomb alert that later turned out to be false, the airline said.

The airline said the plane returned to Istanbul airport as a precautionary measure after the alert and underwent an investigation after all the passengers were taken off.

Miami, once known mostly for its abundance of palm trees and bikinis, is forging a new identity as a world arts capital as it hosts the Art Basel fair, attracting collectors and aficionados from around the globe.

Beginning on Thursday and running through the weekend, Miami's edition of Art Basel -- billed as the most prestigious art show in the Americas -- will welcome some 50,000 visitors.