No playing with fire, at least temporarily.

The NFL banned all flame effects and pyrotechnics on its fields for at least the short term, as an ongoing investigation into a fire at the Titans’ Nissan Stadium in Week 2 continues.

A pre-game pyrotechnic machine caught fire on Sunday during the player introductions as the Titans celebrated retiring the jerseys of ex-players Eddie George and Steve McNair. Stadium staff quickly extinguished the machine, while the corner of the field was evacuated.

No one was hurt in the incident.

Teams can still use pyrotechnics away from the field, however, including the Vikings, who shoot off fireworks along the roof of US Bank Stadium will continue.

There is no timetable for the NFL’s investigation of the Titans’ flames, though its clear the team will have to find a new way to fire up the crowd.