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.

ATLANTA — Channel 2 Action News learned late Wednesday afternoon that an apartment building explosion may have been caused by someone stealing copper from inside the vacant building. An open flame then sparked the blast. Neighbors who survived the ...

The explosion at an Aliso Viejo medical building was an "intentional detonation," and the explosive device was delivered to the building, addressed to a specific person, federal sources tell the NBC4 I-Team. One person was dead and at least three were hurt ...