Terrible news emerging from India of a series of explosions on trains in Mumbai. The latest reports suggest 135 people have been killed - although experience tells us that these figures are likely to change over the course of the evening.
For a news channel, an event of this kind sets off a tried and tested set of processes. This is what we call a rolling news story - we're staying on this to the exclusion of all other events. We're calling upon all our resources in India to help us keep viewers up to date. We have two correspondents based in Mumbai, who are at the scene of the explosions.
We have pictures coming in from local news organisations, and our producers in London are checking these before making them ready to go to air. The wire services are providing us with new information - such as the prime minister of India's reaction to what's happened. And our own producers are calling upon their contacts to get as much fresh information as possible.
It's also important for us to provide some context. Our security correspondent Gordon Correra has been on air a number of times in the past three hours explaining the background to the security situation in India. Gordon has a deep understanding of issues related to terrorism around the world, as well as a good knowledge of previous events in India.
It's not our job to speculate, or to guess - but we do use our experience and knowledge to give as much context as we can to the events. As I write, our Pakistan correspondent has just gone on air to report on reaction from Islamabad - President Musharraf has condemned the attacks.
One production team is keeping the channel on air. Another team of people is looking further ahead. Reinforcements are being sent from Delhi to Mumbai, and we are also sending teams on the overnight flights from London to Mumbai. We hope to have one of our presenters anchoring our coverage from Mumbai in the morning, but there's a lot of work to be done first.
Most of all, however, we have to remember this is a terrible human tragedy for many people. We must adopt the right tone, take great care with our use of pictures, and remember that there are people watching who may well be directly affected by the attacks.