An envelope containing a mysterious white powder was delivered to state Sen. Mary Margaret Haugen at her home on Camano Island.

The mail was opened by a house-sitter who contacted authorities.

No one reported any ill effects from the powder.

Members of the Washington State Patrol’s hazardous materials team collected the mail last night and turned it over to the state crime lab in Shoreline for analysis.

Three envelopes were sent to Haugen’s home that all appeared to have the same handwriting. Only one of the three had the white powder in it.

The source of the envelope, which had no return address, was not immediately known. The incident is not being characterized as an act of bioterrorism, but the FBI was notified.

“At this point we are in the waiting game,” said Robbie Burrows, spokeswoman for the FBI in Seattle.

Burrows said they hoped to have the results sometime late Tuesday.

If the substance turns out to be a hazardous or dangerous material, the case will be investigated by the FBI.

If it turns out to be benign, the case will go the Washington State Patrol for investigation

Sen. Haugen, D-10th District, is out of the country on vacation, but is aware of the situation. Haugen and her family are on vacation in South Africa.

“She appreciates the hard work and quick response from the Washington State Patrol, the FBI and the state Department of Health,” Nova Gattman, a Haugen aide. “The contents of the envelope are still being investigated. The person who opened the letter is being treated and appears to have suffered no ill effects.”