yes, hoosiermama. responsibility was claimed by a group within 48 hours but those claims were initially dismissed:
http://nypost.com/2014/03/10/chinese-group-claims-plane-disappearance-amid-parallels-to-lockerbie/
the Malays say that a 35yo Uigher was on the plane. He has variously been identified as 1) a flight engineer; 2) a person who had taken flight training; 3) a professor; and 4) a person traveling with the Chinese calligraphy team.
The Uigher man identified as a professor has self-identified himself to authorities, and upon a closer look, seems to be a case of the wrong person with a matching name to that of the 35yo Uigher that was on the plane.
The name of the missing Uigher person is A. Maimaitijiang
http://www.themalaymailonline.com/malaysia/article/uighur-professor-i-was-not-the-one-on-mh370
Do we know the national origin of the co-pilot?