Four young teens have been arrested after the torture and killing of two sharks (search) and a ray at a California aquarium.

Vandals broke into the Aquarium of the Pacific (search) in Long Beach Sunday night. When aquarium staff arrived Monday, they found debris in the shark tank and the cow-nose ray (search) on the concrete pool deck.

A two-foot-long, striped bamboo shark was found dead in a bird exhibit and a three-foot-long nurse shark was found in the bushes. They had been stabbed or poked with plastic pipes.

An aquarium spokeswoman says the staff was "all very sickened" by what happened.

Police say three 13-year-olds and one 14-year-old were arrested while trying to break into the aquarium a second time Monday night. They're being held on suspicion of animal cruelty and trespassing.