A van struck four people at the Netherlands' largest music festival in the early hours of Monday, killing one of them and injuring the others before driving off, police said.
Sunday's event -- which will be the first concert by South Korean artists in the North for more than a decade -- comes as a diplomatic thaw quickens on the peninsula after months of military tensions.
President Donald Trump branded the attacker -- who raked a crowd of thousands with gunfire from a 32nd-floor hotel room, leaving 59 dead and at least 527 injured -- a "demented man."
Dutch police detained a second suspect on Thursday after a Spanish tip-off about a possible attack caused the cancellation of a rock concert in Rotterdam a day earlier.
The State of Qatar has strongly condemned and denounced the explosion which took place at a concert in the British city of Manchester and resulted in dozens of deaths and injuries.
A 27-year-old man shot dead two people and injured 11 others at a concert in Austria before turning his weapon on himself, police reported Sunday.