Pakistan's Benazir Bhutto International Airport has been cleared to resume operations following a security threat on Monday.
The airport, which serves Pakistan's capital Islamabad, resumed operations approximately an hour after it was put on red alert, according to a tweet from the Pakistan Civil Aviation Authority.
The International Business Times (IBT) reported that all entrances and exits were shut and flights were diverted to alternate airports following reports of "intruders".
The incident happened on the same day that the country issued eight arrest warrants for militants associated with an attack on the Karachi airport in June, which resulted in the deaths of at least 37 people.
IBT further quoted Jawad Nazid, 25, who owns the unofficial Twitter account of the Pakistani air traffic authority, as saying that the "intruders" were "non-state actors" that were "trying to do stuff which is termed 'illegal.'"
Another source reported on Twitter that two men were held, but there has been no official confirmation by law enforcement officials.
The Pakistani Express Tribune reported that at least one flight, Pakistani International Airlines Flight 853 from Beijing, was diverted to Karachi.
The paper further reported that Thai Airways Flight 350 took off from Islamabad en route for Bangkok later in the night, following an emergency-related delay.
Following last week's horrific attack on a Peshawar school, which resulted in the deaths of 148 people, the Pakistani Prime Minister made a vow to eliminate terrorism from the country.
The Times of India reported that after his statement, an anti-terrorism court in Karachi issued non-bailable arrest warrants against eight people, including Pakistan Taliban chief Mullah Fazlullah, for the June militant assault on Karachi airport.