aaron, tell me just what you know. reporter: hi, brooke. well, i m standing not far from the scene of this activity, the incident that unfolded. police just confirming on twitter that there has been some sort of incident at brussels grand central train station. you can see it in the distance there. they have set up a security perimeter around the station. you can see a very large police presence. there s also a military presence out on the street. the military presence there, largely because brussels is on a continued heightened state of alert due to the terror threat. no suggestion so far that this incident at the moment is a result of terrorism. what we do know from police tweeting out that there has been an incident at the train station, one of the main train demonstrations here at brussels. the police also tweeting that the situation is under control, asking that they follow that