Other residents were treated at Jersey’s Town Hall, with St. Helier Constable Simon Crowcroft confirming some were now able to leave, and were being collected by friends and relatives.
States of Jersey Police this morning delivered supplies to the Parish Hall for those that remain.
“No-one here was actually injured, but we had people whose windows were blown in, and others from further away who’d been woken by the explosion and had to evacuate, they just came here in the first clothes they could find,” he said.
“Our biggest concern is for those in hospital and if some people have lost their lives then our thoughts are with their families.”
Mr Crowcroft said the incident was the biggest to affect St. Helier since the gasworks explosion in 2012, when the Town Hall was also a key focal point for helping those affected.
Islands Energy Group CEO Jo Cox said in a statement: “We are co-operating fully with the emergency services following the serious incident in St. Helier this morning.
“Our thoughts are with the residents of the area and anyone who has been affected.
“We are working with Jersey Fire and Rescue to understand exactly what has happened and will share more information once it is available. We ask that Islanders continue to follow the advice given by emergency services at this time.”
A cordon remains in place around Pier Road, extending down towards the Weighbridge.