An arrest has been made mere hours after an explosion Wednesday at the Toontown section of Disneyland, prompting the park to shut down for several hours. A park employee is now at the center of the investigation by the Orange County Sheriff's Department.

Christian Barnes, 22, described as an outdoor vending "cast member" was taken into custody after police reviewed park tapes of the area. It is believed that Barnes caused the explosion by using a dry ice bomb, which is a plastic bottle filled with dry ice and sealed tightly.

"This is a simple device. It's not a pipe bomb filled with gunpowder, but it definitely will generate an explosion," said John Goodpaster, an explosives expert at the Purdue School of Science at Indiana University-Purdue University Indianapolis. "If somebody was throwing something out, they could have been injured."

Barnes, of Long Beach, Calif., is being held on $1 million bail. Neighbors have described Barnes as a good kid who comes from nice family. At first investigators were unsure whether this was an isolated incident or connected to the number of other dry ice bombs that have gone off around Los Angeles lately, but they now believe this was Barnes' first offense.

"Barnes is cooperating with investigators and has indicated this is an isolated incident with unanticipated impacts," Anaheim police Sgt. Bob Dunn said after the arrest Wednesday morning.

The explosion occurred around 5:30 p.m., though nobody was injured and there was no property damage inflicted. While Dunn believes that Barnes is the culprit, he has also stated that he does not believe that the 22-year-old was aware of the seriousness of his actions.

"This is a very serious incident with very serious consequences that could include the injury or death of people," Dunn said.