“We received the alarm call at 11.24pm and deem the report to be very credible. The children were shocked by the incident,” said Lars Alvarsjö at Handen police.
The two children, a 12-year-old boy and a 14-year-old girl, report seeing the head lying on the sea bed.
“It was the boy who first spotted the head. He told his sister, who did not believe him. But then she caught sight of the head.”
Police deployed emergency service divers during the night but by 8am they had been unable to find anything.
“We haven’t found anything, but there was a delay before we received the alarm and there are tides in the area,” said Lars Alvarsjö.
The search will on Tuesday be extended with the help of divers from the national task force.
There is currently no known missing person who could be connected to the find.