Icelandic authorities now say threats of wildfires have officials on "high" alert and that eruption fissures were bigger than scientists initially thought after Wednesday's eruption of the once-dorman

Spectacular drone footage captured the Sundhnúkur volcanic fissure erupting in southwest Iceland on Wednesday. A river-like flow of lava illuminated the landscape after a massive 1.5-mile fissure opened up in the early hours of the morning.

The North Atlantic island nation is on high alert after lava spewed across the Reykjanes Peninsula and smoke belched into the sky.