Law enforcement officers have detonated a German bomb that washed up on Cobo Beach.
A controlled explosion has been monitored by three or four members of the bomb disposal squad at around 5.40pm.
It meant the road was temporarily closed between the beach car park and Iceland.
Officials say the explosive device could have washed up several days ago, but they aren't sure.
Three other bombs have been found and removed by law enforcement in the past week.
Ross Le Brun is Guernsey's new deputy-elect
Veteran of previous election bids wins the first island wide by-election with 953 votes.
How Guernsey is celebrating 81 years of Liberation
Events are taking place across the island to mark the 81st anniversary of the end of the German occupation.
Polls open in Guernsey's first island wide by-election
Eleven candidates are standing for the single vacant seat in the Assembly.
Iran effect looming in Guernsey's latest inflation figures
RPI has risen to 4% for the three months ending March.
Alderney to explore data centre hosting
A study says data hosting could make substantial money for the island through leases and royalties.
Prime Guernsey seafront location for sale
The site of the former Octopus restaurant at Havelet is on the market for an undisclosed sum.
Woman (20) arrested on suspicion of attempted murder in Guernsey
There's been an increased police presence around Victoria Avenue after a suspected attempted murder.
Last day to register for Guernsey's upcoming by election
The island's electoral roll closes at midnight on 25 April.
