Officers have been called out to deal with a shed fire on Rohais De Haut.
Guernsey Police and Guernsey Fire and Rescue were in attendance at around 8am.
Smoke was seen billowing into the sky, with people in Alderney reporting being able to see it.
It was extinguished and the road is back open.

Guernsey sewage pipe repairs "unlikely to be a quick"
Guernsey FC to fight for promotion at Victoria Park
Move to return St Julian's House to Guernsey's emergency shelter
Jersey and Guernsey included in UK-Gulf trade deal
St Pier says States put investigation before his experience in P&R seat vote
Industry leaders warn against paying Guernsey's under 18s the same as adults
Hot, hot, hot, Bank Holiday weekend ahead!
Ferry firm eyes Alderney to improve inter-islands connections