SPOKANE, Wash. (AP) _ A Hewlett-Packard Co. research engineer who had been romantically spurned by a co-worker was arrested Friday in connection with a bomb that injured her when she opened a package last week, authorities said.

Gary L. Tong, 28, was arrested during questioning by investigators from the Bureau of Alcohol, Tobacco and Firearms and the Spokane County Sheriff's Department, said Special Agent Jack Ballas of the regional ATF office in Seattle.

Tong admitted sending the package that blew up in Katherine S. Crowley's face as she opened it March 4, Ballas said. Tong had been romantically interested in Ms. Crowley, 24, a fellow engineer, but she had rebuffed him, Ballas said.

Agents and detectives were searching Tong's office and home Friday afternoon, and charges were being prepared, Ballas said.

Tong has been an engineer in the Spokane division's research and development department since June 1980, said Liz Wavada, company spokeswoman.

Ms. Crowley was admitted to Sacred Heart Medical Center with first- and second-degree burns to her hands, face and neck. She was in satisfactory condition Friday, a hospital spokeswoman said.

Tong has been an engineer in the Spokane division's research and development department since June 1980, said Liz Wavada, company spokeswoman.

Charges will be filed in Spokane County Superior Court next week, Ballas said. Federal charges of manufacture and possession of a destructive device also would be filed, he said.