(Adds details on provider, systems are rebooted)
VIENNA, Jan 11 (Reuters) - Austrian lender BAWAG said its online banking services and its website were back to normal after temporarily shutting down on Thursday due to technical problems, but added that a cyber attack could be ruled out.
The systems were rebooted early in the afternoon after BAWAG's internet provider A1 Group, a Telekom Austria unit, said a battery damage at its own power supply system had led to a temporary disruption of the IT system.
"Power supply and operations at the data centre are back in a reliable state," A1 said in the statement.
A BAWAG spokeswoman confirmed all systems were back to normal, adding it was too early to assess the damage.
Reporting by Kirsti Knolle; Editing by Shadia Nasralla and Susan Fenton