An Alaska Airlines flight from San Francisco to Seattle was diverted to Portland late Monday night after a "strong smell" was detected on board. 

Ray Lane, a spokesperson for the airline, says Flight 1323 landed safely on the ground. There are no injuries. 

"There's no indication that there was a fire on board. The plane is being inspected by technicians to pinpoint the cause, Lane said in an emailed statement.

"We apologize for the inconvenience this has caused our guests, who are being rebooked on flights to Seattle." 

The Airbus 319 aircraft departed San Francisco International Airport at 9:14 p.m. Monday. It arrived at Portland International at 11:08 p.m.

Silent Rangel, his wife and two daughters, were on board at the time. He says they noticed a "vibration" in the plane when they were about halfway to Seattle. It wasn't violent, he says, but did seem abnormal. Shortly after, his wife asked him if he smelled something burning. 

Rangel, who lives in Arlington, says they noticed flight attendants' behavior change, as they began moving from one end of the plane to another. 

"Shortly after that, they got on the loud speaker and announced we were landing in Portland for safety reasons," Rangel says.