On a flight from Malaga, Spain to  Manchester, England, passengers were concerned about two "Asian or Middle Eastern looking men acting suspiciously".

On the instigation of the passengers, the flight attendants were alerted, who in turn alerted the crew, who got the airport security to remove  the men from the flight.

The actions was described as "mutiny" by some news media. The suspicious behavior turned to be that the Asian men were in their twenties and talking Arabic, and wearing leather jackets although the weather was hot.

They were questioned for several hours, and found to be harmless, and caught a flight back later in the day. 

Read the details in this BBC article. and in Muslim News UK.