In the wake of Friday's terrorist attack in Paris, France, U2 is likely to be canceling their sold-out performances, ET has learned.

The band was scheduled to play on Saturday and Sunday at the AccorHotels Arena in Paris as part of their iNNOCENCE + eXPERIENCE tour, with Saturday's show to be broadcast live on HBO in the United States and Canada.

A source close to U2 tells ET that they "do not see how the show could happen tomorrow." A source close to production tells ET that it is "unlikely the show will go on, but there has been no official decision as of yet."

READ: Hostages Held at Eagles of Death Metal Concert in Paris During City-Wide Attack

The President of France declared a state of emergency on Friday after a series of shootings and explosions began at multiple sites throughout the city, including the Stade de France and Bataclan concert hall.

According to multiple reports, approximately 100 hostages are being held at the music venue, though a statement from the French band Red Lemons indicates that they, as well as the American rock band Eagles of Death Metal, were safely outside of the venue.

U2 is currently in Paris, where they had been rehearsing for the weekend's shows. A source tells ET that all band members are safe at their hotel.

Just before the attacks began on Friday, rehearsal footage had been posted to U2's official Facebook page.