
Sanit said police had learned that the group called itself the Ultras Thailand but the group members concealed their faces.
He said the group smuggled fireworks into the stadium by handing them in other cheering gears.
The group lit up the fireworks of the Thai national team scored the first goal. Red flare and thick smokes were seen over a spot of the stand.
Sanit said police were checking for more information to try to pinpoint the group members to take against them.