Referee Thomas Leonard immediately halted proceedings and sent the two teams back to the changing rooms, as the emergency services started to tend to the injured.
At least three people were seriously injured when celebrating fans surged forward, breaking a safety barrier under the pressure, at a French League One game between Amiens and Lille, leading to the match being abandoned.
He said 25 people had been injured, four of them seriously.
The stadium, which holds 12,000 people, was evacuated after a security meeting.
The collapse occurred as visiting fans celebrated Fode Ballo-Toure scoring Lille's opening goal in the 15th minute.
The collapse happened when Lille led 1-0.
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Director general Marc Ingla tweeted: "We are thinking first and foremost of our supporters".
"We are giving them all our support".
"We hope the LFP (Ligue de Football Professionnel) identifies those responsible".
"The Amiens President's words seem irresponsible and insensitive given the nature of this dramatic situation". All but six - five Lille fans and a steward - were able to go home overnight.
"But I expressed myself poorly and I want to apologise with sincerity to the supporters of Lille". Our supporters are impeccable and professional football needs to be better organised.