be care fful about sharing on social media. there are some gruesome images going around, but they don't want that to compromise their investigation either. the last incident a couple years ago, it got to a certain point where the home secretary brought in the elite forces, the sas, they came in on helicopter to london bridge. we haven't seen that quite yet. that was early in the morning, the roads were clearer. what we have here is many buses still trapped on the bridge. whilst they evacuate the entire area, you can see that going on onscreen now, the police are trying to lock down the individual sites. clearly something ongoing. we heard earlier from a bbc reporter he clearly heard g gunsh gunshots. we don't know whether they were the perpetrator's or police responding. all we know is the stabbing is the incident they are