The dance arena of the Danish festival was closed following an unprecedented influx of fans. Security closed the arena after Le Grand had played just one record.
Roskilde officials were on high alert following a previous incident that cost the lives of two festival goers. In this instance organisers spotted the problem early and acted quickly in the interest of security.
Fedde described the scenes, in which amazingly no one was hurt, as "terrifying to watch".
Le Grand returned to the stage after a 45 minute break to resume his set under stricter security controls.