Gov. Linda Lingle's office received a letter with a suspicious substance today, said Honolulu Fire Department Capt. Terry Seelig.

HFD's hazardous materials teams were investigating the package. An initial test with a confidence rating of 98 percent indicated the substance inside was cornstarch, Seelig said.

Lingle is just the latest state chief executive to have received a suspicious package in the mail. Envelopes containing suspicious powder have been received this week by governor's offices in Alabama, Alaska, Maine, Michigan, Minnesota, Mississippi, Missouri, Montana and Rhode Island.

The fifth floor of the Hawaii state Capitol building was closed for hours this morning after a clerk found the suspicious letter with a return address from San Antonio, Texas.

Hazardous material crews determined a white substance in the letter was either cornstarch or baby powder.

A Lingle spokesman said the governor is on Maui today, and was never in the office.

The suspicious letter was found about 10:30 a.m. The fifth floor of the state Capitol reopened to the public about noon.

The envelope at Lingle's office was discovered by a clerk going through Lingle's mail this morning, according to Russell Pang, Lingle's spokesman. The governor's office had been alerted earlier in the week to be on the lookout for an envelope with a San Antonio return address.

The clerk found the letter, set it aside and notified security.

Lingle was on Maui to address the Maui Visitors Bureau.