LONDON — A man was arrested under Britain’s Terrorism Act after a terminal at London’s Heathrow airport was evacuated on Tuesday because of a suspicious bag, police said.

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Passengers were allowed back into Terminal 2 after the bag was checked and cleared by specialist officers.

An airport source, who declined to be identified, said a police swab test for explosives on the bag had showed positive, but that it was not a viable bomb.

A police spokeswoman declined comment on whether explosive substances had been detected but said a man had been arrested under the Terrorism Act and was being questioned by officers.

She gave no further details.

A man was seen running in and dropping a bag at the check-in area, airport personnel had said earlier.

Airport operator BAA said the terminal was evacuated in early afternoon after the suspect bag was found. It reopened at 5 p.m. (noon ET), it said.

“Some disruption to Terminal 2 operations should be expected for the remainder of the day,” a BAA spokesman said.

Terminal 2 serves European destinations from Heathrow, one of the world’s busiest airports.