Firefighters contained a Waianae Valley blaze that charred 1,200 acres and threatened homes. 

Residents were back in their homes Wednesday night, but told KITV they still felt on edge.

The AP reports:

But state firefighters continue to monitor hotspots in the Waianae Kai Forest Reserve, where endangered plants and native tree snails are found. State officials say efforts to fight the fire entails mostly helicopter water drops because the steep mountain terrain makes it dangerous and difficult for ground crews.

Monday’s fire began near Navy property in Lualualei Valley, then crawled over to Waianae Valley and spread into the forest reserve. Flames and heavy smoke required the evacuations of some homes but the Red Cross closed its shelter on Wednesday.

The cause is still under investigation.