Around 40 people, including a three-year-old child, were treated by paramedics after a chemical leak in a crowded swimming pool of a holiday park in England.
Guests dressed only in their swimwear were evacuated as the resort went into "lockdown" after the incident.
Holidaymakers suffered from breathing problems, although no-one was thought to be in a serious condition after the leak at 2.30pm yesterday at Wild Duck Holiday Park in Belton near Great Yarmouth, Norfolk.
Tom Cassidy, a spokesman for Haven Holidays, which runs the resort, said 40 people were originally treated by paramedics and 33 "walking wounded" were taken to three different hospitals as a "precaution".
A three-year-old was among the casualties taken to Norfolk and Norwich Hospital, James Paget Hospital in Great Yarmouth or Ipswich Hospital, Mr Cassidy said.
He said: "There was a chemical leak in the swimming pool in the entertainment complex and it was evacuated while police and fire and rescue were on their way.
"Thirty-three people have been taken to three local hospitals as a precaution. They include one three-year-old child and a member of staff.
"The casualties have been described to me as walking wounded.
"Obviously the park is now in lockdown while they try and source the chemical leak."
He said some guests had been allowed back to their caravans, but the pool and other parts of the complex are closed as investigators probe what happened.
He said: "Team members from the resort have now gone to each hospital to liaise with the guests. As most of the guests were evacuated wearing only swimwear, other team members have gone to their caravans and removed clothing to take to the hospital.
"Other guests at the resort were later allowed back into their caravans although the swimming pools and entertainment complex remains sealed off while health and safety officials carry out investigations."
Police, fire and ambulance crews rushed to the resort, which is nestled in the woods.
Norfolk police said: "It is believed there are around 40 casualties who are being treated by ambulance crews."