ISIS has threatened to hit the UK ‘harder and more bitter’ after claiming responsibility for the Brussels bombings today.

At least 34 people have been killed and many more have been left injured after a series of bombs in blasted inside an airport terminal and Metro station in the space of 79 minutes.

The explosions come just a day after the Belgium Interior Minister warned of possible revenge attacks after the arrest of Paris massacre suspect Salah Abdeslam in the city last week.

And through the terrorist group’s official Telegram account, a statement read: ‘We promise to the states that are allied against the Islamic State that they will face dark days in return for their aggression against our state.

‘And what will await you will become harder and more bitter through the grace of Allah.

‘In praise of Allah who has made our blows precise and helped us succeed. we demand for him to accept our brothers among the martyrs.’

A major manhunt is underway for an ISIS suspect in a white coat and black hat who fled Brussels Airport after the two explosions ripped through the terminal in a suicide bomb attack this morning, killing 14 people and injuring dozens of others.