Dutch prime minister Mark Rutte has expressed his condolences to British prime minister Theresa May following the Manchester concert hall bombing, describing the attack as ‘terrible news’.

‘A great evening ended in tragedy,’ Rutte said on Twitter. ‘Our thoughts are with the victims.’ Twenty-two people, including children, were killed and dozens injured in the attack after the concert by Ariana Grande in the northern English town.

Dutch counter terrorism chief Dick Schoof met officials and event organisers on Tuesday afternoon to discuss security issues in the Netherlands, broadcaster NOS said.

‘We are going to decide if measures already being taken are sufficient or if more needs to be done,’ Schoof is quoted as saying. ‘Concerts are soft targets and you could predict that attacks could happen at such events.’

The threat level in the Netherlands remains four on a scale of one to five.

Schoof urged people planning to watch the Europa League final between Ajax and Manchester United on Wednesday on giant screens on the Museumplein in Amsterdam to remain alert.

‘If you see strange behaviour, warn security guards or the police,’ he said. ‘It is better to be safe than sorry.’