This morning an explosion occurred on a District Line train at Parsons Green station in south west London.
The BBC report that 22 people have been sent to hospital suffering from burns.
The incident is being treated as an act of terrorism by the Metropolitan Police.
In the wake of these sort of events various stories, images and speculation emerge online, despite only a small amount of details being disclosed to the public.
However, it's important to remain sensible and vigilant in these moments.
Here's what you can do to help
1. Get your information from official news stories
You may see in the next few hour and days lots of news related to this event.
Only trust information that you know is from official source.
Double check all that you read has been confirmed by authorities and think before you decide to share anything on social media.
2. If you think you have information, send it to the right source.
If you witnessed what happened in Parsons Green this morning, have any footage or images, please share it with the police.
Sharing it online before contacting the authorities can be a hindrance to their investigation and your evidence could be of great benefit.
3. Don't share graphic or distressing images
Try to avoid sharing pictures of victims or other graphic images that you encounter.
These can cause distress to others - especially if family or friends were involved.
4. Follow the advice of the authorities
Police have put in place the following instructions for you to follow.