Two massive bombs detonated just outside the Stade de France in Paris on Friday as the German and French soccer teams were playing, killing three people.

In addition to the dead, “several’’ people were injured by the blast “in front of stadium door number J,” said Noel Le Graet, the head of the French Football Federation.

Suicide bombers were blamed for the attack.

“A big boom, something like ‘boom,’ ” photographer Xavier Barret told The Guardian about the blast. “I said, this is incredible, I’ve never heard this kind of noise in the stadium.”

Apparently, very few spectators at the sold-out 80,000-seat stadium immediately realized what was going on — and bizarrely, the game was allowed to continue until the end, when France won 2-0. At that point, many avid fans turned their attention away from the soccer field and learned from their cellphones and social media what had happened.

Most of them, fearing there were more bombs hidden in the stands, ran onto the field.

Thousand were still milling around on the grass a half-hour after the game ended.

“Confused fans have flooded the pitch,’’ tweeted witness Andy Scott, referring to the field.

The doors to the stadium were blocked, and no one was allowed to leave for at least 30 minutes — except French President François Hollande, who was at the match and immediately evacuated.

He was taken to the offices of the Interior Ministry, where he led a crisis meeting with Prime Minister Manuel Valls and other top officials.

When fans were finally allowed to leave through three gates that were deemed safe, many demonstrated their resolve to fight terror by singing the French national anthem, “La Marseillaise.’’

Others appeared dazed and walked out hugging one another as they desperately looked at their phones for information on what had happened in their city.

“People were afraid, because by this time they had heard by telephone or on the Internet that there were bombings outside and in Paris,” Barret said.

Helicopters converged on the stadium and circled overhead.

Spectator Jerome Pugmire tweeted that he heard “a couple of very loud bangs outside Stade de France midway through the first half. Police sirens, I’m not sure what it’s all about.’’

A Twitter user named Arnlowe posted the question everyone was asking: “Who the hell is doing this?’’

One spectator described the scene at the stadium as “surreal.’’

Later, Fox News contributor Geraldo Rivera said that his daughter was in the stadium during the attacks.

“It’s very upsetting,” Rivera said on Fox News. “It’s a lot easier to report these things and to experience them myself than if it is your child.”

Rivera said his daughter escaped the mayhem safely.

“Thank God her friend called her mom, her mom called me. We’re very concerned. We won’t rest until she is in her apartment.”