Tennis players at French Open rattled by sonic boom

On Court Suzanne Lenglen, the second-biggest stadium at the French Open, Dominik Koepfer was interrupted mid-serve by the sonic boom’s loud clap.

Before the cause of the loud sonic boom was known, there was a brief moment of panic outside the grounds of Roland Garros.

A tennis player at the French Open was visibly startled by a sonic boom on Wednesday just as he was about to serve a ball.

Before the cause of the loud bang was known, there was a brief moment of panic outside the grounds of Roland Garros in western Paris as police officers gave instructions to cordon off the area with the possibility of evacuating people.

A few security officials sprinted down Boulevard d’Auteuil — a long road leading to one of the main entry gates — shouting into walkie-talkie radios.

A few minutes later, police revealed the cause of the noise: a fighter plane breaking the sound barrier.

"A very loud noise was heard in Paris and in the Paris region. There isn’t an explosion, it’s a fighter plane which has broken the sound barrier," French police wrote on Twitter.

"Don’t clog up the help lines!" they added.

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One police officer on Boulevard d’Auteuil walked up to a security official guarding the gates and told them it was false alert before joining colleagues in his patrol car.

But with no forewarning, residents around Paris — along with fans and players inside Roland Garros — expressed their fears of an explosion on social networks. About 45 minutes later, nearly 17,000 people had retweeted the reassuring news.

On Court Suzanne Lenglen, the second-biggest stadium at the French Open, Dominik Koepfer was interrupted mid-serve by the bang’s loud clap.

His shoulders dropped and he pulled out of his serving action, then looked across the net at opponent Stan Wawrinka. The Swiss player looked equally bemused as he stood perfectly still before play eventually continued.

Five years ago, as France was playing Germany in a football friendly at Stade de France, two explosions started a wave of deadly terror attacks in Paris.

The first explosion was largely unnoticed by the players on the field that day, but the second caused France defender Patrice Evra to stop playing with the ball at this feet as he looked up trying to comprehend what he was hearing.