we want to show you outside now to david stephenson. from your vantage point outside the gates, who are you seeing? >> i'm seeing the gate that was closed about 5 minutes ago. it's fully shut. that was just before a number of officers came rushing down in riot gears. they all took the escalate or down, stood outside the entrance gate and then went in. there's another dozen standing upstairs as well, too. but there are dozens and dozens of tourists and locals standing by looking on curious about what's going on out here. we could hear the echos of the let them go chant. there's still people exiting the station as well, taking their time to leave, but again you can hear that shouting that's going on. it's drawing a big crowd outside. >> you say they are chanting let them go. who are they talking about? >> the presumetion is that the people being held inside by the gate. we have heard some people chanting that outside as well. the picture takes the story and the police presence in there that has restricted access inside powell street bart