Jersey Gas says it's not sure if a gas leak found near Bagot Road contributed to last week's explosion.
It happened around 350 metres away from the incident, and the company says it has since been repaired.
In a statement, a spokesperson says it is continuing to support the emergency services and States departments in their investigation.
"On Friday 18 January, Jersey Gas located and repaired a gas escape 350m from the incident.
It is not clear if this gas escape contributed to the incident."
Manholes covers were blown 25 feet into the air on Thursday lunchtime.
The road was closed for more than 24 hours.

£75,500 raised in Jersey Christmas Appeal Charity Auction
Government to announce support option for carers
Drink driving can cause 'life-changing' consequences
Parked cars damaged in Victoria Avenue crash
L'Ecume II: Lewis Carr jailed for 20 months for fatal collision at sea
Guernsey's former Chief Minister admits making indecent images of children
Minister approves 42 sheltered homes at nursing home
Jersey potato farm to be the site of Channel Islands' largest roof solar array