Update at 5:36 p.m. ET. U.S. Attorney Will Investigate:

During a press conference today, Mayor Tom Tait asked for calm. He also said that the Office of the U.S. Attorney had agreed to investigate the shootings.

"The first step is to get to the truth," Tait said according to the Orange County Register. "That takes some time and patience, and that's what I'm asking for."

Our Original Post Continues:

Long before the era of post-Sept. 11 security precautions in the U.S., an unknown person or group of people may have begun carrying out a series of bioterrorism attacks in California.

The target? Menthol-scented eucalyptus trees.

Before you wonder why you hadn't heard of this, it's because the story isn't necessarily true. It's a hypothesis, a theory promoted by a noted California entomologist and eucalyptus expert named Timothy Paine.

If his theory is correct, then somebody out there wants those trees dead.

Digging For Clues

For Stockton, Calif., Bankruptcy 'Freezes Everything'

Jul 20, 2012

Many cities around the country are faced with growing costs and shrinking revenue. Despite making sweeping cuts, Stockton, California recently became the largest city to file for bankruptcy. Host Michel Martin talks with Stockton Mayor Ann Johnston about how she's managing a city that's operating in the red.