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.
Alex Scott named in England squad
Bournemouth midfielder Guernsey's Alex Scott has been named in Thomas Tuchel's first England squad since the World Cup.
Dangerous cycling on Guernsey roads
E-bikes are being abused by youngsters riding 'three up' on machines designed for an adult and small child.
Closure ongoing at Guernsey's leisure centre
A major effort continues to trace the source of Legionella bacteria and then stop it happening again.
Guernsey's leisure centre closed for another day
The long term solution is the installation of filters to stop Legionella bacteria getting into the water system.
Health authorities to consider 'cot cams' recommendation
A call for video monitoring of babies in neonatal cots and incubators will be considered by both Jersey and Guernsey's health authorities.
Guernsey tax backlog 'worse than thought'
Guernsey's tax backlog is worse than thought and will take two years to clear, an update on the troubled Revenue Services has revealed.
Warning issued over smart glasses use
People who use smart glasses are being urged to act responsibly and consider the impact on other people's privacy.
£22m Children's Services hub plans advancing
Guernsey's States will be asked to approve a new hub for Children's Services, costing up to £22 million.
