Air India is apologizing after a recent flight out of San Francisco International Airport had cockroaches onboard.

The Mumbai-bound flight had two passengers reporting they spotted the pests on the plane, a spokesperson for the airline said.

The plane got a deep cleaning during a scheduled fuel stop in India's Kolkata.

Air India provided the following statement:

"Despite their regular fumigation efforts, insects can sometimes enter an aircraft during ground operations. Air India will be undertaking a comprehensive investigation to determine the source and the cause of this incident and implement measures to prevent recurrence."

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