Calling for the release of dolphins at the National Aquarium in Baltimore, about two dozen protesters gathered outside the complex Saturday and held up signs seeking to raise awareness about whales and dolphins in captivity.

The Baltimore Sun (http://bsun.md/23y3acd ) reports the demonstration was part of an international event called Empty The Tanks Worldwide. Organizers say events were planned at 61 locations across 22 countries.

In 2012, the National Aquarium eliminated its high-flying dolphin show in favor of a more relaxed exhibit.

Aquarium CEO John Racanelli said two years ago the organization was considering moving its dolphins to a sanctuary. Eight Atlantic bottlenose dolphins live at the National Aquarium.

Kate Rowe, spokeswoman for the aquarium, says the organization is still deliberating about what to do.