Prime Minister Benjamin Netanyahu has sent two rescue planes to the Netherlands after Israeli football fans were reportedly injured in clashes in Amsterdam, AFP reports.

“Prime Minister Netanyahu views the horrifying incident with utmost gravity and demands that the Dutch government and security forces take vigorous and swift action against the rioters, and ensure the safety of our citizens,” his office said in a statement.

The prime minister’s office did not say what led to the “very violent incident against Israeli citizens”, but Dutch media AT5 reported clashes on Thursday night between fans at a Europa League match in which Israeli football team Maccabi Tel-Aviv faced Ajax Amsterdam.

The report said numerous fights as well as acts of vandalism had occurred in the city centre. A police spokesperson told ANP news agency that 57 people had been arrested.