Whitcliffe Mount School in Cleckheaton has decided not take pupils to the capital today due to “recent events”.
The prime minister has raised the threat level from severe to critical for the first time since July 2007, meaning “not only that an attack remains highly likely but a further attack may be imminent”.
Several arrests have been made since the attack as police investigate the possibility that the bomber – who was named as Manchester-born Salman Abedi – may not have acted alone.
The Islamic State terror group claimed responsibility for the barbaric attack involving a device packed with nuts and bolts which exploded in the foyer of the arena as thousands of young people were leaving the concert.
The bomb – which is believed to have exploded at about 10.30pm – was designed to cause maximum carnage, sending metal fragments flying through the arena’s foyer as the concert came to a close.
Prime Minister Theresa May denounced the “appalling sickening cowardice” of the suicide bomber and it was revealed that 12 of those rushed to hospital were children.