As the horse meat scandal continued to spread across the continent, European Union officials scheduled a Wednesday meeting to discuss the issue, an Irish official said Monday.

Simon Coveney, Ireland's agriculture minister, called for the informal session in Brussels, Belgium, inviting the EU Health Commissioner Tonio Borg and ministers from other European Union nations.

Coveney said officials need to take "whatever steps may be necessary at EU level to comprehensively address this matter."

French officials said Monday they will take measures to ensure that no suspicious products remain for sale.

Officials said customers of the food supplier at the center of the uproar, French-based Comigel, will be inventoried.

"We will look (starting Monday) at who their clients are and, as a consequence, we will see what products will have to be taken off the market because there is a reasonable suspicion that these products are composed of horse meat and not beef," said France's junior minister for the social economy, Benoit Hamon.

Horse meat has been discovered in products that are supposed to be 100% beef sold in Sweden, the United Kingdom and France. As many as 16 European nations may be involved in the supply chain, officials say.

French officials said that they should know by Wednesday whether fraud or negligence is to blame for the scandal.

Agriculture Minister Stephane Le Foll said regulators weren't at fault.

"This is not a regulation failure," he said. "We have to stop saying that just because there is a fraud. That's like saying that just because there are police officers around and that an accident happens, there is a failure on the part of the police officers."

Tesco, which operates grocery stores in 14 countries worldwide, said Monday it discovered horse meat in spaghetti bolognese products made by Comigel. Most of the samples showed small amounts of horse meat, but three contained more than 60%, Tesco said in news release.

"The level of contamination suggests that Comigel was not following the appropriate production process for our Tesco product, and we will not take food from their facility again," said Tim Smith, a Tesco executive.

Also Monday, Romania denied any responsibility in the scandal. Prime Minister Victor Ponta said the two Romanian slaughterhouses initially suspected to have links to the horse meat scandal never had direct contact with Comigel and haven't done anything illegal.

"This tendency to throw the responsibility as far away as possible, eventually to the new members (of the European Union), to countries that might have a weaker PR policy, is something that bothers me," he said.

Minister of Agriculture Daniel Constantin said there is no evidence false horse meat labeling occurred in Romania.

The news conference came in response to food supplier Findus France saying it will file a legal complaint against a Romanian business that is part of the supply chain. It did not name the business publicly, nor did the Romanian officials.

Authorities in Europe have said there is no immediate cause for health concerns, but government officials in the UK and Sweden are testing the meat to be sure there is no danger to public health.

The blame chain and legal action

Swedish food producer Findus announced Thursday that it had withdrawn its lasagna from stores as a precaution. The products were pulled Monday after Comigel raised concerns about the type of meat that was used, Findus Sweden said.

Findus said a letter from Comigel dated February 2 informed Findus that the contamination may date back to August.

Findus is only one of several companies that receives products from Comigel, headquartered in Metz, France. Others in Sweden and Britain have pulled products from shelves.

Six big French retailers said Sunday that they were recalling lasagna and other products.

Findus Nordic, which oversees Findus throughout the Nordic region, said it has begun legal action against Comigel and its subsuppliers.

"Comigel is the villain," Findus Nordic CEO Jari Latvanen told CNN on Sunday.

Comigel has not responded to CNN's requests for comment. The company did not answer its phones when CNN called repeatedly. Neither the company nor CEO Erick Lehagre responded to an e-mail request for comment.