Scientists have identified an orange-coloured gunk that appeared along the shore of a remote Alaska village as millions of microscopic eggs.
But the mystery is not quite solved. Officials with the National Oceanic and Atmospheric Administration said they do not know what species the eggs are or if they are toxic.
They have sent samples to a laboratory on the East Coast of the US for further analysis.
Reality TV teen mum arrested
A teenager who stars on MTV's reality show Teen Mom 2 has been charged with a probation violation.
Jenelle Evans was brought to the county jail in Brunswick, Georgia.
The 19-year-old Evans was charged with assault in March after a fight recorded on video. A month later, she received probation and community service for a drug paraphernalia charge.
Teen Mom documents the challenges of four teens' first years of motherhood.