A new report from the NTSB says that PG&E detected natural gas at the Hayward explosion site after crews supposedly capped the leak. Here are what other details it revealed about the hours leading up to the explosion that sent three people to the hospital.

NEW YORK (WPVI) -- A gas explosion in an apartment building in the Bronx caused a partial collapse Wednesday morning, leaving a corner of the building a pile of rubble. A birds eye drone photo provided of the partial building collapse in the Bronx by the FDNY.

A massive gas explosion ripped the corner off a 20-story Bronx NYCHA apartment building, sending bricks and debris raining down on the street below, officials said. The explosion occurred around 8:15 a.m. on Alexander Ave. near E. 138th St. in Mott Haven ...