EWING, N.J. Investigators trying to track down who sent anthrax-laced letters questioned residents and workers along a suburban Trenton mail route Friday as authorities said a second postal worker has the skin form of the disease.

FBI "evidence teams" fanned out in neighborhoods in Ewing Township to trace the route of a letter carrier who was diagnosed with anthrax earlier this week.

"You may see us taking mailboxes away," FBI spokeswoman Linda Vizi said. "We are now able to concentrate on this individual's routes and her daily activities with the post office in order to try and find out the source of the anthrax."

The carrier may have handled contaminated letters sent to NBC anchor Tom Brokaw on Sept. 18 and Senate Majority Leader Tom Daschle's office in Washington on Oct. 9. Both letters were postmarked in Trenton.

In Washington, Homeland Security Director Tom Ridge said the FBI has been able to identify the mailbox where anthrax-tainted letters had been sent. He did not elaborate.

Ewing is a working-class municipality of apartments and single-family homes that makes up one of Trenton's three suburbs.

The infected carrier, whose name was not released, served 250 to 300 addresses, including homes, apartment buildings and a few businesses, fellow letter carrier Jim Bittenbender said.

He said his colleague didn't remember handling anything unusual.

"We pick up thousands of letters from this office. One letter carrier may pick up hundreds," he said.

The infected carrier works at the small West Trenton post office, one of 46 central New Jersey stations that feed mail to the regional distribution facility in Hamilton some 20 miles away.

Authorities announced Friday that a mail sorter at the Hamilton facility was infected with cutaneous anthrax, a much milder form of the disease than the inhaled form that killed a Florida man Oct. 5.

The 35-year-old Levittown, Pa., man was in stable condition at a hospital and is expected to recover, Pennsylvania Department of Health spokesman Richard McGarvey said.

"It isn't life threatening in any way," he said.

The man was admitted to a hospital Wednesday with blisters and a rash on his neck. A blood culture confirmed the anthrax diagnosis Friday. McGarvey said authorities are not certain how he contracted the disease.

In a statement released by the hospital, the man said he is "doing well and feeling fine."

"I'm in good hands under my physicians' care. I m also looking forward to returning to work as well as the golf course," he said.

Tests results were pending on a third New Jersey postal employee, a maintenance worker who serviced mail-sorting machines at the Hamilton facility. Postal officials have said they are virtually certain he has the disease.

The Hamilton and West Trenton facilities were closed Friday. State and federal health officials said all employees should see a physician and begin a seven-day course of antibiotics.

The state has been under scrutiny by investigators since suicidal hijackers crashed four airliners into the World Trade Center, the Pentagon and a Pennsylvania field on Sept. 11.

At least six hijackers are believed to have lived in a Paterson apartment, including Hani Hanjour, who apparently crashed the Pentagon jet. The suspected ringleader, Mohamed Atta, bought a plane ticket to Spain from a Paterson travel agency in July.

FBI spokeswoman Sandra Carroll also said the FBI is going to test items removed last month from a Jersey City apartment after reports that the apartment contained articles on sarin nerve gas and the National Center for Infectious Diseases.

The apartment once belonged to Mohammed Jaweed Azmath and Ayub Ali Khan, who have been detained since they were picked up in Texas on an Amtrak train Sept. 12. Authorities said they were carrying about $5,000 and box-cutting knives similar to those used by the hijackers.