Five children were killed and several injured after winds lifted a bouncy castle into the air.
The Co-op Borough hall in Leicestershire was hosting a school party, the local council said, after the group contacted the authority to request its use.
Tomlinson Cottage Hospital confirmed five patients had been admitted, all of whom had serious but not life-threatening injuries.
Leicestershire Police said they were called to reports of a bouncy castle being lifted into the air and crashing into the street at around 4.20pm, on Tuesday.
A spokesman said: “Emergency services attended and established there were five casualties, believed to be children.”
At least one person was killed and there were several others injured in the incident in Accrington.
Both incidents follow a huge dust storm sweeping across large parts of the South East.
A Leicestershire Police spokesman said the children were hurt after a bouncy castle was blown into the road in Heywood, Leicestershire, just before 4pm.
He said: “A large clear-up operation is under way and cordons are in place to secure the incident area.
“Our thoughts are with the families of those involved in this incident.”