In the wake of Sunday night’s shooting in Las Vegas, all Monday night shows planned for Cirque du Soleil and Blue Man Group in the city have been cancelled.

Cirque du Soleil confirmed the cancellations in a statement released on Monday, which added that none of its employees have been identified among the victims and that the organization is continuing to check in with employees. All tickets for cancelled shows will be refunded.

“Cirque du Soleil’s deepest thoughts and sympathies are with the victims, their loved ones and the Las Vegas community,” Cirque du Soleil said in the statement.

The shooting took place at the Route 91 Harvest Music Festival when 64-year-old Stephen Paddock of Mesquite, Nev., opened fire on the crowd from the 32nd floor of the Mandalay Bay hotel. With 58 dead and over 500 injured due to gunfire or the resulting crowd stampede, this shooting is the most deadly in modern U.S. history. Paddock was found dead in the hotel room.

Additionally, a spokesperson for Caesars Palace confirmed that all shows scheduled for Monday night at the venue have been canceled.

“The entire Caesars Entertainment family is deeply saddened and we are keeping the victims, their families and the first responders in our thoughts and prayers,” the spokesperson said in a statement. “In light of the attack, and out of respect for all those impacted, all of our shows will be dark tonight. Tickets for tonight’s performances can be refunded at the original point of purchase. Additional details regarding show times for tomorrow are forthcoming.”

A source tells Variety that Celine Dion’s show for Tuesday night at the Colosseum is scheduled to proceed as planned, as of now. Other sources were unable to confirm plans for Jennifer Lopez’s Vegas show at Planet Hollywood, with the next one being scheduled for Wednesday.