A section of Town House Road in Vienna was closed Monday after a woman found powder inside her mailbox.

State police Lt. Mark Brooks said troopers are searching for those responsible for putting the suspicious powder in the box.

“If anyone saw any suspicious vehicles in the area, we’d appreciate them calling us,” Brooks said.

Police and paramedics were called to 487 Town House Road around 10:30 a.m. Monday after a homeowner, Cathy Meader, found yellow powder inside her mailbox. Some of the powder got on Meader’s hand, Brooks said.

Paramedics checked Meader and determined she was not in medical distress, but firefighters closed the road around the home as a precaution.

State police as well as inspectors from the U.S. Postal Service, who arrived with a portable laboratory, tested the powder and determined that it had come from a fire extinguisher, Brooks said. He said there was too much powder to have been delivered inadvertently on a letter.

“For whatever reason, it looked like someone had deployed the fire extinguisher toward the mailbox,” Brooks said.

The road reopened around 12:30 p.m.

Brooks said the incident was unsettling for the homeowners.

“Any incident like that draws some concern for both the citizens affected and public safety,” he said.

Brooks asked anyone with information about the incident to call state police at 800-452-4664.

Craig Crosby — 621-5642

ccrosby@centralmaine.com

Twitter: @CraigCrosby4