Pakistan International Airlines, flight PK-798 was travelling from Toronto in Canada to Lahore, Pakistan yesterday when the crew decided to divert it to Manchester, London.
The Boeing 777-200 aircraft remained on the ground for about 3 hours, then continued its journey, the AeroInside reported.
The airline said the toilets of the aircraft choked after something solid was thrown into by unidentified passengers.
According to a statement issued by the airline's spokesperson, the toilets are connected to a common drain line, all toilets onboard the aircraft were rendered unusable.
Chairman of PIA directed passengers to strictly adhere to and carefully read the warning signs in the toilets.