"The man was arrested on suspicion of threatening behaviour and is currently in custody at a west London police station. No reports of any persons injured and no firearms were deployed," the spokesman said, as quoted by the Mirror newspaper on Sunday.
READ MORE: Heathrow Airport Reopens After Lockdown Due to Suspicious Item (PHOTO, VIDEO)
According to the newspaper, the London police were called to the Terminal 3 at Heathrow Airport at about 7:00 GMT after receiving a message about a man armed with a knife.
The police said that the detained man is in his 20s.
It was noted that the object he was carrying was not a knife, but another metal object.
Last November, armed police responded to a suspicious package in Heathrow's Terminal 4, which resulted in a brief airport's lockdown, however, the item turned out to be harmless.
