The company carried out the work the day after the incident on Bagot Road, but it is not known whether the leak was connected to the explosion.
In a statement, Jersey Gas said: ‘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.
‘We are continuing to support the emergency services and States departments in their investigation.’
Just to confirm that the traffic light controls put in place on Bagot Rd on Friday have now been removed. The drains have been fully vented, the covers are back in place and the road is now back to normal.
— States of Jersey Police (@JerseyPolice) January 21, 2019
Two manhole covers were blown about 30ft into the air in the blast, which left the road closed for more than a day.
