AZ Alkmaar have apologised after ultras sought to attack the family section carrying West Ham fans on Thursday night.

Ultras targeted the stand carrying families and friends of West Ham players after AZ's Europa Conference League semifinal defeat.

AZ said in a statement of apology: "Unfortunately, we cannot use the word 'supporters' for these people."

The club said they will "evaluate" the incident.

"While everyone hoped for a historic European match, it turned into a pitch black evening due to the events occurring at the referee's final whistle," AZ's statement added.

"It turned into a night to reflect on with shame. Not because of the football game played, but because of the behaviour of some visitors.

"What happened is beyond all bounds. The club again sincerely apologises to West Ham and the thousands of well minded AZ supporters who have also been inconvenienced by the misconduct.

"AZ is a civilised club where sportsmanship and norms and values are paramount. The club will do everything possible, together with the authorities involved, to identify these persons and to take appropriate measures."