The decision to file criminal charges could hinge on whether or not Scott or the organisers stepped in to stop the concert once they knew people were becoming injured or killed.
Just after the rapper Travis Scott was performing, the surge broke out, Houston Fire Chief Samuel Peña told reporters at a news conference.
The vehicle was travelling along a treacherous mountain highway in Uttarakhand state when it careened over an edge and plunged at least 500 metres (1,640 feet) with around 45 people onboard.
The overcrowded stadium in Malang in Indonesia's East Java province descended into chaos after police fired tear gas to disperse agitated fans who had poured on to the pitch at the end of the match. It was one of the world's worst stadium disasters.
"The Salvadoran Football Federation deeply regrets the events that occurred at the Cuscatlan Stadium," the organization wrote on Twitter. "It also expresses solidarity with the relatives of those affected and deceased in this incident."