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.

Authorities in southern Colorado are investigating after a sudden explosion damaged a building and startled nearby residents.

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 ...

CLEVELAND, Ohio (WOIO) - The Michigan-based owners of Rainbow Terrace apartments say the experts they hired found no conditions within the building caused the June 23 explosion. Their expert did find a leak in the utility’s natural gas line that served ...

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 ...