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The breaking news this morning. investigators looking at tuesday night's train derailment in philadelphia focused on excessive speed as the cause. officials say the train hit that tight curve on philadelphia's north side at 106 miles per hour. that is more than twice the posted speed allowed there. the death toll from the crash now stands at seven. more than 200 people were injured and eight of them this morning still in critical condition. we have news from nepal. at least two major earthquakes in the last two weeks. a search by foot and air is finding no sign of a missing u.s. helicopter. ...

Ripley at the base of operations of the search in kathmandu. good morning, will. >> reporter: hi john. behind me are indian military helicopters that landed a short time ago. they are awaiting instructions as they go out and search. india and the united states and nepal are searching for the missing marine helicopter into three sectors. there are 400 nepalese soldiers on the ground searching for the helicopter. they are in boats scouring the rivers in the area. no communication with the helicopter carrying six marines and two nepalese soldiers. john. >> what about the overall humanitarian situ...

Of the incident or anything unusual. the next thing he recalls is being thrown around coming to finding his bag, getting his cell phone and dialing 911. >> reporter: all right. again, over my shoulder you can see that this is the track where this all happened. investigators from the very beginning, they suspected speed simply because of the angles and the way the wreckage was left on the tracks. also, the extent of the damage. still, there are so many other questions. we know this train was going fast, we do not know why. was it faulty brakes or human error where perhaps this engineer may have...

Perhaps he may have been distracted at this point. >> rene that's the engineer. what do we know about the conductor? has the conductor spoken to authorities yet? >> reporter: we know that detectives definitely want to speak to the conductor. another key person who was on board that train. however, i'm told that because of his medical condition, detectives have not been able to interview him yet and the ntsb hasn't interviewed any crew either. >> rene these are the things they will do. thanks so much. philadelphia mayor michael nutter places the blame on the shoulders of brandon bostian. the ...

Condition. i want to get the latest on the investigation. let's bring in cnn's rene marsh. rene, we learned that the engineer told philadelphia police after the crash the other night. >> reporter: that's right, john. we know as you mentioned this train was going a whopping 106 miles per hour along this curve that had a speed limit of 50 miles per hour. according to a law enforcement source immediately after the crash, this engineer told philadelphia police detectives that he didn't recall his speed. detectives have since tried to interview him further, but he refused to answer any other questi...