A bombing suspect who is accused of blowing up a hotel toilet in Copenhagen, along with himself, is a one-legged amateur boxer who was born in insurgency-racked Chechnya and has shown what one scholar calls "highly professional" tradecraft in concealing his identity and purpose from Danish authorities. The would-be bomber's target, Danish police said, was likely the Jyllands-Posten newspaper, which sparked outrage throughout the Muslim world in 2006 by publishing 12 cartoons depicting the Prophet Muhammad and has been the object of at least one foiled terrorist attack since. "We are reasonably sure that was the target," Chief Superintendent Svend...