Emergency services were called out to an Essex seafront after beachgoers stated they were having a hard time to breathe.
Police, paramedics and the fire service went to the beach at Fourth Avenue in Frinton-on-Sea, after getting calls at about 14:00 BST.
The cause is unidentified and is being examined.
Miriam Lansdell informed the PA news firm: “My child began coughing. She stated ‘I do not feel great. It harms to inhale’.”
The 45-year-old psychological health employee from Derbyshire, who remained in Essex with her twin children visiting her moms and dads for the weekend, stated she likewise had trouble breathing as she lay on the sand drying off after a dip in the water.
‘Not what you anticipate’
She stated they all started to breathe more quickly when they moved even more far from the beach, however took the 10-year-old ladies to a walk-in center to be checked out by medical personnel.
Ms Lansdell stated her daddy had actually been informed by somebody in a speedboat, whom he presumed to be related to the coastguard, that there may have been a fuel spill.
She stated: “My daddy stated he had actually been asked to leave the water by a male on a boat. He asked why and the male stated there had actually been a fuel spill. He stated if anybody is having breathing troubles they need to most likely call an ambulance.”
She included: “It’s not what you anticipate when you opt for a day out to the beach.”
The speculation that a fuel spill may have been to blame was not verified by cops or the ambulance service.
One individual tweeted that there were “great deals of individuals coughing greatly”, while a mom stated her boy started coughing after swimming and needed to be provided his inhaler.
Another stated: “We have actually simply left Frinton and have actually seen great deals of fire truck en route out. Has there been an event? We were on the beach and all established a cough and were having a hard time to breathe.”
A spokesperson for East of England Ambulance Service stated: “We know an event on Sunday 25 August with reports of a variety of individuals experiencing coughing on the seafront off Fourth Avenue, Frinton.
“We are helping the authorities and fire services with this event. The cause is presently unidentified.”
Essex Police stated its partner firms were working to attempt to develop the cause as rapidly as possible, and encouraged individuals not to enter into the sea for the time being.