investigate the cause of this crash. denise? wjz has complete coverage of the bus accident. captain mike perry, you have a good view. tell us what you know. reporter: we see at least a dozen pieces of fire apparatus still on the scene. you see that in the foreground. they will be using that to lift that bus over the jersey barrier and back onto the highway once they clear the scene. at this point if the ntsb is involved, i have not heard that they re on the scene and we have not seen them at the moment. the maryland state police still being the lead investigator. because this is a tour bus possibly from another state, there is a strong possibility the ntsb could be involved because it s commercial transportation. just the gridlock roads is the main thing. the scene is status quo. there are a dozen pieces of fire apparatus on the scene. we have more with sharon with how the accident is affect the road. it s causing gridlock in d.c. and the montgomery county area. it wi