An examination of the legal record shows how concern on paper prior to work on a bridge at Baylor University in 2014 did not foreclose choices and lapses in the field that culminated in tragedy.

A fatality linked to a September, 2015 forklift accident at a bridge connecting Wisconsin and Minnesota apparently triggered harsh words from OSHA officials.

Authorities probe safe access into wreckage to find three presumed dead in the Feb. 23 fatal collapse; demolition firm had safely worked on other site structures.

Firms call for a review of new crane-safety regulations they claim are overly stringent in imposing a single wind-speed limit.

Search efforts at the 10-story building in England that suddenly fell on Feb. 23, trapping three workers, are hampered by a "very unstable structure," says one fire official.