All 149 fibre cable lines damaged in a fire at a key SingTel facility were reconnected by 7.15am on Friday, the telco said. "We expect that most affected customers are able to use their services again," SingTel said in a statement on Friday morning.

However, it added that there might still be a need for limited network adjustments which may affect service performance for some customers. "Some customers may experience difficulties in bringing equipment such as modems and set-top boxes back into operation, and we ask them to contact us for assistance," the statement said.

Similarly, OpenNet - the nation's provider of ultra-fast broadband services - said it has also restored all of the affected cables that were damaged during the fire. Two-thirds of the damaged cables belong to OpenNet. "While all cables are repaired, we are still working with our Service Providers to ensure customer connections are functional," OpenNet said in a statement on Friday morning.

As of 8am this morning pockets of affected customers were still not able to access the Internet via that fibre broadband networks.

Now that it has repaired its infrastructure, SingTel said its focus now is to carry out investigations to determine the cause of Tuesday's fire, which crippled several key services including banking and health facilities.

"A group of our engineers will also be deployed to review the quality of the repair works done so far. We will also convene an internal board of inquiry and work closely with IDA to review the robustness of our systems and minimise the impact of such accidents in future," SingTel said.