The police is investigating the circumstances of the drowning of two Vietnamese seven-year-old boys at Lake Lhota near Prague on Friday.
The mothers of the two boys have complained that when they reported the children missing the employees of the bathing resort had not taken them seriously and a search had only been launched several hours later.
The lifeguard was reportedly not at his post because of the heat.
The Czech-Vietnamese Society has called for the incident to be thoroughly investigated.
Eyewitness reports appear to confirm the parent’s claims.