Needless to say, the explosions were enough to warrant a certain Cyborg's attention. He wasn't directly part of any law enforcement branch, but he was required to routinely check in with the Shinsengumi. At the time of the explosions, Cronic was just wrapping up neutralizing a criminal gang. 

"...I don't know what just happened, but it's not good." Cronic said, having tied up the subdued criminals, before going to observe the closest explosion site to his location, checking for anyone acting out of the ordinary, which considering a bomb just went off, would be anyone acting eerily calm, as opposed to anyone shocked, terrified, trying to quell the blaze, or running for their lives.