Heathrow Airport locked down a terminal this morning after reports of a "suspicious item".

At 10am this morning Transport for London announced that the Terminal 4 train station was closed while staff responded to a security alert.

Armed police were seen responding to the reports of a "suspicious item" within Terminal 4, with videos online showing emergency services on the scene.

One user of X, formerly known as Twitter, said: "Heathrow Terminal 4 has been evacuated due to a terror suspect.

"Armed police are on the scene; if you have urgent business there, you cannot enter."

Another X user added: "I'm on a plane being held at the gate at Terminal 4 due to a 'security incident'."

Heathrow has said that the security alert has since been resolved.

The Terminal 4 train station has reopened and it is understood the airport is functioning as usual.

A spokesperson for Transport for London said: “There was a security alert at the station, it was closed for nine minutes.”

The spokesperson confirmed that the station was evacuated during this time, but services restarted promptly with minimal impact.

Heathrow Aiport has stated that the whole incident lasted around 20 minutes.

A Heathrow spokesperson said: "Police responded to a suspicious package earlier today. The situation has been resolved. The airport is operating normally now."