Romania is investigating accusations that horsemeat found in ready meals in several European countries originates from abattoirs there.
President Traian Basescu said the country's reputation is at stake and action will be taken if any laws have been broken.
The BBC reports the investigation is focussed on two abattoirs. There have also been suggestions criminal gangs may be involved.
Meanwhile, six French supermarket chains have withdrawn frozen-beef meals made by Findus and Comigel after it emerged that some foods labelled as beef that contained horsemeat, had been sold in Europe and Britain.
Consumer Affairs Minister Benoit Hamon told Le Parisien that early findings from an inquiry indicated that the horsemeat had been supplied since August.
Findus France director Matthieu Lambeaux, said in a statement the company would file a legal complaint on Monday.
Spanghero has also threatened to take legal action against its Romanian supplier.