The cause of the Monday blast in the breakaway region of Azerbaijan, where thousands have been fleeing for Armenia, was still unclear. Hundreds were wounded.
A novel Pennsylvania law requires corporations that do business in the state to consent to being sued there, even if the suits have nothing to do with the state.
The deadly blast, in the northwestern city of Yinchuan, was blamed on a gas leak, and it is likely to prompt closer scrutiny of restaurants that feature gas grills.