AMSTERDAM (BNO NEWS) — A disruption during a Remembrance of the Dead ceremony in Amsterdam caused panic among the thousands of visitors, injuring dozens of people. The royal family evacuated to safety as two men were taken into custody.

The incident happened on the Dam Square in Amsterdam during two minutes of silence to remember those who died during World War II. An unidentified man was heard screaming a text before a loud sound was heard.

People were screaming and a large crowd of people fled away in panic, pushing people to the ground and climbing over gates. Parents were seen carrying children away as the Royal Family, who were targeted in an attack just over a year ago, evacuated to safety.

Prime Minister Balkenende, who said the incident appears to be deliberate, said at least 30 people were injured, but their injuries are not believed to be life-threatening. Queen Beatrix and Princess Maxima were visiting the injured at the Royal Palace of Amsterdam, where the injured were taken.

“Officers noticed during the memorial a man who spread his arms and heard an unintelligible text,” a statement from Amsterdam police read. “The man was arrested after which the crowd panicked.” Police said a second man, who dropped a suitcase, was also arrested.

Police are investigating the incident and will hold a news conference around 10.45 p.m. local time.