BOCA RATON, Fla. (AP) One of the three supermarket tabloid employees who were exposed to anthrax returned to work yesterday while investigators awaited test results that might help them find the source of the bacteria that killed one of her co-workers.

The 35-year-old woman "is back at work and taking her medication," said Gerald McKelvey, a spokesman for tabloid publisher American Media.

The employee, identified by police as Stephanie Dailey, tested positive for anthrax after a nasal swab test.

Police Sgt. Tom McCabe said the woman planned to speak to reporters later yesterday. "I"m sure she"s freaked out," he said.

The case has prompted fear in south Florida and raised concerns across the country about a biological attack using anthrax. Authorities say the contamination is limited to the American Media building in Boca Raton and that there is no evidence of terrorism. Federal authorities have begun a criminal investigation.

Bob Stevens, a 63-year-old photo editor for the Sun tabloid, died Friday of inhaled anthrax, an especially rare form of the disease. Traces of anthrax were later found in the nasal passages of mailroom employee, Ernesto Blanco, 73, and on Stevens" computer keyboard.

The three-story, 66,000-square-foot American Media building has been closed for 30 days and hundreds of employees are awaiting test results to see if they"ve been exposed.

Also waiting is the FBI. Bags of evidence from the building have been sent to federal Centers for Disease Control and Prevention laboratory in Atlanta for tests.

Dailey"s neighbors said the case has made them more aware of their vulnerability.

"Everything that"s happened so far in the last month is hitting closer and closer to me, and now it"s right across the street," said Jason Tengbergen, who lives three doors away from Dailey.