SEATTLE (AP) _ A gunman opened fire today in a commercial building, killing one person and wounding three others. A search was under way for the attacker.

Police used search dogs in the hunt. Several schools in the area north of downtown Seattle were locked down while the hunt for the suspect continued, KOMO-TV reported.

The shooting happened about 10:30 a.m. in Seattle's Wallingford neighborhood at an office building called the Northlake Shipyard building, police said.

Police spokeswoman Pam McCammon said one person was killed, two were critically injured and a fourth person suffered lesser injuries. Earlier, police had said five persons had been shot. There was no immediate explanation for the discrepancy.

Jeannie Parr said she was about 6 feet from where the shootings took place.

``He came in calmly,'' she told Northwest Cable News. ``I didn't hear any sounds of a confrontation or argument. ... All I heard was gunshots.''

The shootings came a day after seven people were shot to death at a Xerox Corp. building in Honolulu. The suspected gunman, a Xerox employee, fled after the slayings and surrendered hours later.

Scottie Pierce of Seattle Boat, across the street from where the shootings happened, said he was sending his employees home early.

``It's almost a surreal type situation, faced with what the nation went through in Hawaii yesterday,'' he told Northwest Cable News. ``I'm quite concerned that there's someone running around with a gun.''