Arsene Wenger says he was left in shock as he watched Friday's Paris attacks unfold from a hotel room in the city.
The Arsenal manager was due to attend France's friendly against Germany at the Stade de France, which was targeted by terrorists along with restaurants and a concert venue, but was running late.
Wenger travelled back to the UK ahead of France's friendly against England at Wembley on Tuesday and was pictured singing La Marseillaise along with the home and away supporters.
Speaking at his news conference ahead of Saturday's game against West Brom, he said: "I would like to thank the English community and English football who have shown great solidarity. It was a huge shock for our country and our football.
"You always think after this kind of event, 'Do you continue to play or do you stop your life?' For me they made the right decision and the event on Tuesday night has shown it was the right decision.
"The football world has responded the way you want it to respond in a big union and togetherness.
"I was late to the stadium last Friday and I decided to watch the game in the hotel where I was. I was more under shock than fearful. You could be scared because it was four different places attacked. You don't feel secure anywhere.
"Everybody who was in Paris on Friday night was in shock. France is like England - a tolerant and generous country. You have a bit more of a question of security, because it looks like it's not the end of it.
"A way for us is just to get on with life and to respond in a positive way to the situation. We cannot stop everything, try to continue with our lives. It is more a way of life that is being targeted than any individual community."
On the reaction of the England supporters at Wembley, which was lit up in the colours of the French flag, he said: "It showed the class of England. The arch of Wembley in French colours was very significant."
Arsenal defender Laurent Koscielny was in the France side in midweek and was visibly upset as the players linked arms before kick-off.
"You could see he was not himself and it affected him deeply," said Wenger, who also questioned the German authorities' decision to call off Tuesday's friendly against the Netherlands after a security threat.
"The danger in this situation is to over-react a little bit and I think that is what happened," he said.
Aston Villa boss Remi Garde revealed his daughter was in Paris during the terrorist attacks.
"I was on the plane back to France when it happened. Then I was in the taxi and I heard the game on the radio," he said.
"They said there was an explosion outside the stadium. We didn't know too much at this time, then I went home and learned my daughter was in Paris for the weekend.
"I didn't know that. I was scared a little bit but just for two hours because I had her on the phone and it was okay. Everyone in France has a cousin or daughter or friends in Paris.
"All the country was scared. It was very hard. When you know your family is safe it's one point. But when you saw what happened - everybody has been affected a lot. We are still affected by that. It is such a nightmare to see such an attack."