Austria's foreign ministry has been targeted by a cyber-attack that is suspected to have been conducted by another country.

Axar.az reports citing foreign media.

The ministry said the seriousness of the attack suggested it might have been carried out by a "state actor".

The hack started on Saturday night and experts warn it could continue for several days.

The breach occurred on the same day Austria's Green party backed forming a coalition with conservatives .

It was recognised very quickly and countermeasures taken immediately, the foreign ministry said in a statement.

"Despite all intensive security measures, there is never 100% protection against cyber-attacks," the ministry said.