Norwegian offshore support vessel owner Dof Group has been forced to ask for more help from banks and bondholders as its cash position deteriorates.

The Oslo-listed company said the coronavirus, the oil price fall and "extreme" currency moves have all had a direct negative impact on its liquidity.

It was already trying to push through a refinancing plan with creditors that had envisioned injections of NOK 700m ($67m) in new equity while stretching bond maturities.