Spark Signal

Spark Signal (迎電部隊 (スパークシグナル) ) is one of Academy City's dark side organizations whose level of secrecy is similar to that of Hound Dog or GROUP.

Principles
Spark Signal was created for the purpose of dealing with people from Academy City that would try to sell out secrets towards the outside world.

The group strategies take foundations on the concept that "Espers are still human" and thus aim to create viable counter measures by properly analyzing the enemy tactics and taking advantage of their "human weakness", so when facing espers that can create incredible phenomena they can still respond appropriately "First calmly analyze the opponent, then find a way to defeat him". Their battle tactics were of no use against Accelerator's cold, efficient and ruthless assault and the group would be completely decimated by the Level 5 in 300 seconds.

In the same fashion of Hound Dog, Spark Signal displayed tactics which included only warfare strategies and regular weapons instead of the usage of espers or customized prototype weapons.

Background
In their activities, Spark Signal have apparently fought with powerful espers countless times.

DRAGON Arc
By the time of Volume 19 they have revolted against Academy City and started a strange seizing operation incident where they occupy the largest particle accelerator of the world which is situated inside the city, the Hula Hoop. They would held hostage around 30 primary school students, captured from an astronomy field trip; along with their teacher and driver they act as a ‘bargaining chip’ for use against the higher ups.

The group carefully made the plan that included the Hula Hoop and put into it all of their efforts and resources; the demand that they made to Academy City was "disclose all of the information you possess about DRAGON". GROUP later noted how ironically the higher ups used them to get rid of a team who's purpose for rebelling resemble their own hidden agenda.

After the main team from Spark Signal was taken out, a group of survivors tried to made an escape and rethink their strategies from the start; and for that reason GROUP was tasked with chasing down the remnants and deal with them ; the person who directs ITEM also gave orders to her new team to finish them up. While the Spark Signal survivors were executing their plan to escape first they were attacked by Tsuchimikado Motoharu, Musujime Awaki and "Unabara Mitsuki" from GROUP, after escaping them then they would take hostages in a private salon in the 3rd district; one of the hostages was Takitsubo Rikou and thus Hamazura Shiage decided to jump into the fry and stop them; his attack would gravely impair many of the Spark Signals survivors. While Shiage was breaking into the building the Accelerator, who had been chasing them finally caught up with them and proceeded to exterminate the team, after he was done Sugitani appeared and killed all of the defeated members of Spark Signal.

It should be noted that Kinuhata Saiai from ITEM could not engage with the survivors from Spark Signal, since Stephanie Gorgeouspalace contacted Spark Signal and offered her help in dealing with her, act which kept busy Saiai by the time when Shiage and Accelerator were raiding the private Salon.