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Several people were transported to local hospitals, but the extent of their injuries was not immediately clear. The whereabouts of the gunman are not known, the police said.

Don Jacksa, a software engineer who works at the office complex, said that he heard unusual noises at about 11:30 a.m., but did not think much about them until one of his co-workers said the sounds had been gunfire. The co-worker locked the office door and they huddled inside until the police arrived, he said.

Mr. Jacksa said he thought that at least 100 people had been evacuated from the office complex.

The shooting occurred hours after Gabrielle Giffords, a former member of Congress who was wounded in a shooting in Tucson in 2011, addressed the Senate Judiciary Committee, pleading for reform of the nation's gun laws. "We must do something," she said. "It will be hard. But the time to act is now."