NBC Bay Area. . At least six people were killed, including four Americans, after an explosion at a building that may have been caused by a gas leak.

Why this stamp.

• “NBC Bay Area. . At least six people were killed, including four Americans, after an explosion at a building that may have been caused by a gas leak.” may be true only under conditions the headline skips — timing, who you are, or what “counts” as proof. The desk leaves room for those missing pieces instead of forcing a hard Real or No Proof.
• The claim rests on attribution, a soft verb, or an unfinished process rather than a closed fact on the record. That is unsettled coverage, not packaging alone and not a settled event.
• A fair desk leaves it Depends until the missing condition or second check lands. Readers get the stamp that matches the uncertainty in the piece.