Dozens of passengers on a Qantas plane that was forced to land are being treated for smoke inhalation, WA paramedics say, in the second unscheduled landing at Perth Airport on Monday.
A Qantas spokeswoman said Karratha-bound QF904 returned to Perth around 2.40pm after cabin crew noticed an unusual odour.
A spokeswoman for Perth Airport said a warning system had also lit up, and all passengers safely disembarked after the unscheduled landing.
While the Qantas spokeswoman said there were "no reports of any passengers affected", a St John Ambulance spokesman said paramedics were treating 75 people at the airport for smoke inhalation.
He said some may need to be taken to hospital for further treatment.
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It is believed the pilots may have been affected.
"We're working closely with the Department of Health should a mass transport be required," the spokesman said.
Earlier on Monday, a Qantas A380 passenger jet travelling from Dubai to Sydney was diverted to Perth after the air conditioning developed a fault when the plane was above the Indian Ocean.
"As a precaution the aircraft descended to 10,000 feet and the captain requested a priority landing," Qantas said in a statement.
No one was injured.
