From the earth to the moon, we've got you covered in today's edition of CNN Student News. We're going to get starting in Bronx.

Yesterday, we reported on a train accident in that brought of New York City. 4 people were killed and more than 60 other were injured when 7 cars jumped the tracks. The big question now is what happened. Was the train going too fast? Was there a problem with the breaks? Was human error involved? Investigators are getting information of the vent recorders that were on the train and some of the passengers are giving their stories of what happened.

"I got thrown across back and forth and it came like a halt. And there were just people screaming."

Early Sunday, a throne of rescue workers s. the grisly thing one rail car nearly plunging into the river where divers checked for bodies under water.

"I can see some people flying from my left like the r. side. People from the back...It's just crazy."

At 7:20 AM, the commuter train carrying 150 passengers on its way to Grand Central Station from P. approached an extremely sharp curve that required a speed limit of 30 miles per hour along the H. River. Compared to the straight way prior, requiring a speed limit of 70 miles per hour.

"The curve has been here for many many years, right? And trains take the curve but it can't just be the curve."

The train conductor said he tried to apply the breaks but says it didn't work as all 7 cars derailed barreling off the tracks.

"By the time I looked up, there was completely going off its track and there was just like a rubble from the tracks like flying at my face."

Only 1,700 feet away from a previous July derailment. That's where 10 garbage freight cars flipped on their side.

"We don't know what the train speed was. We will learn that from the vehicle event reporters."

This is the 2nd passenger train derailment in 6 months from m. In May, an east bound train derailed in Bridgeport, Connecticut and was hit by a west bound train. 76 people were injured. Sunday's crash nearly similar to the train that derailed in northwestern spin killing 79 passengers. In that crash, the train was approaching a sharp turn. Security video showed the shocking moment the train going more than twice the speed limit hurdle of the track. Officials are looking into what role. If any speed play in the Bronx accident.

Next story today, M. is 85 years old. He's an American lives in California. In October, he took a 10-day tour of North Korea. He never left North Korea. The country shut itself off most of the world. It's run by a dictator, Kim Jong-un who can be unpredictable. So, it's hard for other countries to know what the North Korea government is doing or why. M. was detained by North Korea officials right before his plane left. Another American, K. Beth was arrested in North Korea last year. They can be released soon but as one expert says when it comes to North Korea, nobody knows very much.

"I can understand that in US, in western countries, there is misleading information and propaganda about DPRK."

North Korea state media released this video over the weekend of detained American tourist, 85-year old M. reading a handwritten apology. Pyongan saying N. admits his guilty of big crimes when he fought for US in the Korean War killing civilians, working with anticommunist g. and planning now, 60 years later, to try to meet up with them. The video shows N. signing the 4 page statement read on camera dated November 9th and sealing it with his thumb print in red ink. What happened to him next isn't clear. After being held since late October, taken of a plane just as his tour group was leaving. The White House is now weighing in. A spokeswoman saying the US is deeply concerned, calling on North Korea to release N. and fellow American K. Beth now held for more than a year but one expert says that could complicate an already sensitive situation.

"North Korea doesn't want to give the impression to the world that North Korea is giving into the demand or pressures coming from Washington."

Former UN ambassador, Bill Rich., who says his North Korean contacts aren't responding, told CNN on Sunday that Kim Jong-un isn't following North Korea's usual pattern of releasing Americans after getting the proprted confession.

"So, this is baffling. This is a newly regime of the new leader and I suspect he's sending different signals but nobody knows what those signals are."