SEATTLE (AP) — A Seattle-bound Alaska Airlines flight was diverted to Portland, Oregon, after a strong smell permeated the passenger cabin.

Alaska Airlines Flight 1323 departed from San Francisco at about 9 p.m. Monday for what was expected to be a two-hour flight to Seattle.

The airline says that sometime during the flight, a strong smell was detected onboard, and the captain decided to make an unscheduled landing in Portland to figure out the cause of the problem.

The aircraft landed safely, and passengers were rebooked on other flights to Seattle.

Crews inspected the plane to try to determine the cause of the odor, but found no indication of a fire onboard the jetliner.