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A fire alert has gone off at Heathrow Terminal 4.

Airport staff are investigating "as a matter of urgency" after the alarm was activated shortly before 1.30pm on Thursday (July 6).

The airport terminal was reopened at around 12pm following an evacuation.

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Full story

Here’s our full story on the evacuation earlier.

'Complete chaos'

She added: “We stood there for about 15 minutes while the alarm was going off and the alarm was saying staff will direct you where to go.

“[It was] complete chaos as people were trying to get out of this exit.”

An eyewitness speaks

Harriet Constable has just told our reporter:

“Nothing’s really happening now, the fire alarm has gone off and everyone has gone back to normal.”

However, when asked about the evacuation process, she said:

“Complete mess, I was standing down one end of the terminal when the fire alarm went off, people kind of wandered out of their shops looking a bit confused, and then it emerged very quickly that no one in any of the stores that work here had received any training or information on where they’re supposed to direct people in the event of a fire alarm.”

She spoke to someone from Dixons who said “we are as in the dark as you” .

Another video from the scene

Give evacuation feedback to Heathrow

For anyone with complaints about a ‘horrible’ evacuation, Heathrow is suggesting people should email feedback@heathrow.com with any ideas for improvement.

Picture shows Terminal 4 evacuation

Terminal 4 was evacuated following a fire alarm
Terminal 4 was evacuated following a fire alarm (Image: Twitter/@kevinostoll)

'Operating normally' at 2.15pm

Heathrow Airport said at 2.15pm that Terminal 4 is now ‘operating normally’.

We’re now operating normally in T4. Rest assured, our focus is on the safety and security of our passengers and staff.

'Horrible evacuation'

Replying to Heathrow Airport’s announcement about the evacuation on Twitter, one person said: “It was a horrible evacuation. Took 15 minutes before the passengers behind the security gate were directed where to go to.”

"Staff have instructions"

Freelance journalist, Harriet Constable added:

“Staff will direct you to a place of safety” says fire alarm @HeathrowAirport T4, but no staff have instructions of where to send people.

"Massive rush to get out of emergency exit"

Freelance journalist Harriet Constable has been tweeting from the scene.

She said:

Massive rush to get out of emergency exit at @HeathrowAirport T4, no directions, hundreds of people queuing to get through door.

Heathrow Terminal 4 REOPENED

“T4 has now been reopened following an earlier fire alarm evacuation; thank you for your patience as we worked to ensure everyone’s safety.”

The scene is described as 'chaos' by freelance journalist Harriet Constable

The scene inside Terminal 4
The scene inside Terminal 4 (Image: Twitter/@HConstable)

Around 35 minutes ago

We believe the fire alarm went off around half an hour ago at 1.20pm.

The evacuation is still ongoing now.

Heathrow confirms evacuation

Heathrow Airport has confirmed an evacuation has taken place.

Terminal 4 has been evacuated following a fire alarm. We are currently investigating this, and will update customers as soon as possible.

Heathrow 'will keep passengers informed'

The latest from Heathrow, a slightly edited statement:

“We are investigating this as a matter of urgency and we will keep passengers informed with updates. Thank you.”

Video of the scene at Terminal 4

'Utter chaos'

The scene at Terminal 4 has been described as “utter chaos”.

And some shop staff have reportedly said they have no training on where to go.

Just two days after Terminal 3 evacuation

On Tuesday, Terminal 3 at Heathrow was evacuated at a very similar time.

Alarms went off at around 1pm and thousands of people had to leave the airport terminal.

It was a “false alarm”.

'Matter of urgency'

The official Heathrow Airport Twitter account told multiple airport users that it was investigating as a “matter of urgency” shortly before 1.30pm.

“We are investigating this as a matter of urgency and will provide an update shortly. Thank you,” the tweets read.

Reports on Twitter of Terminal 4 evacuation

We’ll try and find out more and bring it to you as soon as we get it.