Speaking of explosions, two manhole covers exploded Friday morning in San Francisco's Financial District. CBS 5 notes: "Reports indicated two manholes exploded near the area of Sutter and Montgomery Streets around 7:30 a.m. Smoke was reportedly coming from the manholes, and a power outage was reported in the area." A reason for the exploding manholes has yet to be determined.

Montgomery between Bush and Sutter is currently closed.

Update: The cause, per PG&E and KRON 4 appears to be secondary gas mains and an underground vault fire. This is beyond ridiculous. [Appeal]