A woman who was treated for a jellyfish sting in Waikiki late Wednesday morning was taken to an area hospital in serious condition. 

Lifeguards counted 10 box jellyfish and 12 people were stung as of 11:45 p.m. today at Waikiki, the Ocean Safety Division reported.

Ocean Safety posted warnings signs at all Waikiki and Ala Moana beaches.

Emergency Medical Services personnel at 11:30 a.m. Wednesday treated  a woman in her 20s for a jellyfish sting at the lifeguard tower near the police station in Waikiki.

She was taken to an area hospital in serious condition.