Manoa valley is a popular area for hiking especially on the weekends.
Three people were injured after a rock fell from above on Saturday afternoon.
The rock did not hit anyone directly.
Fire officials say the rock fell from an area above a waterfall off the Manoa Tunnel Trail.
The rock hit another area first then split into pieces and the flying pieces injured the hikers.
This happened around 2:30 p.m.
Fire officials say a 33-year-old man was injured on his leg. He declined treatment.
A 13-year-old girl injured her wrist. She was able to walk on out on her own.
A 7-year-old girl injured her back.