Published: 2017-09-15 11:16
Last Updated: 2017-09-17 10:44
Londoners fled in panic and jumped out of train doors after a 'fireball flew down the carriage', according to Twitter and local news sources.
The event occured on the Parsons Green (District Line) train in West London, leaving some with facial burns.
Paramedics are at the scene to treat the wounded, while security forces are investigating the incident.
The The Metropolitan Police have confirmed that the explosion is being treated as terrorism.
New reports suggest a total of thirty people being injured from the explosion.
Residents of Dover port were evacuated after a police search was underway for a house in Sunbury-on-Thames, Surrey.
According to bomb specialists, CCTV images in the London tube suggest the bomb did not detonate "correctly", while the situation was raised to critical levels from authorities to prevent the suspects from detonatnig another bomb.
According to the BBC, two suspects were thus far arrested, with the first being an 18-year old man that is in police custody, on suspicion of terror, at the Port of Dover earlier today.
The second suspect is a 21 year-old man who was arrested in Hounslow - west London on Saturday night under section 41 of the Terrorism Act. He remains in custody at a police station in south of London.
Daesh has claimed responsibility for the attack. The Met's Assistant Commissioner Mark Rowley said it was "very routine" for the group to claim the attack, whether in contact with those involved or not.