Earlier this week, I spent several days in the disputed northern Iraqi city of Kirkuk to film a story about how life has changed since it had been taken over by Kurdish Peshmerga forces. This used to be one of the most dangerous cities in Iraq. When I had visited the previous year, I couldn't move around without an armed escort. This time, the mood seemed lighter. Residents told me they felt safer than before. The rampant violence that had once marred the city seemed to have subsided. But it didn't take long for the fragile peace to shatter. Just as I was getting ready to drive back to Erbil, a suicide blast ripped through a busy Kirkuk street in a Kurdish neighborhood. I was on the scene to witness the chaotic aftermath of the attack.