(CNN) -- Four children were found unconscious on a Quebec beach Saturday morning and later pronounced dead after they were caught by the tide while taking part in a fishing trip, police said.

A spokesperson for Quebec provincial police told CNN that emergency crews were called at 2 a.m. local time Saturday to Portneuf-sur-Mer, a riverside municipality on the north coast.

Eleven people went missing after leaving on foot for a fishing excursion and being caught by the tide, the spokesman said. Six of those 11 people were rescued, and five remained missing overnight, he said.

Around 6 a.m. on Saturday, four children, all over the age of 10, were found unconscious and sent to hospital, according to the spokesman. Police later confirmed that the children had died.

A man in his 30s is still missing, according to Quebec provincial police, and is being searched with divers, boats and helicopters.

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Quebec provincial police are investigating the circumstances of the incident, according to the spokesman.

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