At least 50 people died and dozens more were injured after a gunman opened fire inside Pulse, a gay nightclub in Orlando, Fla. Saturday night.

In the wake of the massacre, several TV stars took to Twitter to express dismay and outrage over what is the deadliest mass shooting in U.S. history. A "Violence on TV" panel that had been planned for Sunday at the ATX television festival in Austin, Texas was canceled. Producers of Sunday's Tony Awards also said they plan to dedicate the ceremony to the victims.

Here are some of the celebrity reactions: