India, March 11 -- Air India on Monday confirmed that flight AI126 from Chicago to Delhi on March 5 was forced to return to its departure point because multiple lavatories on the Boeing 777 jet became unusable and said that the problem was caused became people flushed down "polythene bags, rags, and clothes".

The aircraft cited its internal investigation based on objects found by maintenance crews who discovered the objects in the aircraft's plumbing system, and appeared to pin the blame on flyers by urging "passengers to use lavatories only for the purposes they are meant for".

Experts, however, said the disclosure gives rise to more questions.

"About an hour and forty-five minutes into the flight, the crew reported some of the lavato...