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There was an explosion. they know that. they believe that the injuries, according to the nypd, were limited to him. cnn's jason carroll live on the scene. he joins us on the phone. what are you seeing? what are you hearing? >> reporter: well, chris, i'm standing right in front of port authority on 30, 41st, and 8th avenue. what they've done along 8th avenue is they set up a number of frozen zones leading all the way up here into the scene. one mta employee describes it this way. she was downstairs, underthe ground in that large area you were talking about. she heard a loud boom. she said every...

People walk through these tunnels, get off the buses there. >> and this is monday rush hour. >> exactly. >> this is monday rush hour. let's go to our jason carroll, our correspondent down at the scene. jason, what are you seeing? what are people saying from the location you are, right in front of it? >> reporter: yeah, poppy, let me just show you. we are actually, you are correct, right in front of the port authority at 41st and 8th avenue. you can see a number of police still here at the scene. we are in what we're being told is one of the frozen zones. a secure area that they've set up along...

Belowground in a walkway between where i'm i'm standing and times square. so some reports that this happened in times square when it happened. obviously you can understand why they say the situation could have been much worse. it's one of new york city's worst nightmares. again this happened at about 7:20 this morning. one mta worker who was working in a booth described it this way and said she was sitting there working and all of a sudden she heard the explosion and started running and left everything behind. they had to borrow the producer's cell phone to call her daughter and let them know ...

Here in the city. he also said he made this device at work. that's what he said. the suspect was in serious condition and the headline is speaking to investigators and yielding at least so far with some information about his motive. >> they said it was low tech. what more do we know about it some. >> that's the way investigators are describing it. low tech. it was a pipe bomb that was strapped to his body and he used velcro and zip ties to detonate the device. it detonated below from 42nd and eighth. in a walkway between where i am standing and a walkway that leads to times square. one mta wor...