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Environment secretary Owen Paterson said his Romanian counterpart was convinced meat had been packed and correctly labelled when it left the country.
But Mr Paterson added: "The fact is, we do not know yet, and we need to get absolutely clear where the problem has occurred and get it sorted."
When he was asked why UK local authorities could not get tests on meat going to schools and hospitals tested before April, he said: "There is a limit across Europe and across the world in laboratory capacity. We would all like these tests to be done as fast as possible."
The National Beef Association has hit out at the "murky" side of the processing industry in the wake of the horsemeat scandal and called for all UK beef to be labelled with the words "United Kingdom" origin on its packaging.
Chris Mallon, national director of the NBA, urged consumers to prevent "further cheating" by suppliers by ensuring the beef they purchased was taken exclusively from cattle born, reared and processed in Britain. He added:
The FSA is meeting retailers and suppliers today, David Cameron's spokesman has confirmed, and the first "meaningful" results of a programme of product tests by retailers and suppliers should be available by Friday and will be made public.
Those tests may point to the possibility of fraudulent behaviour, the spokesman said. But he played down the chances of an import ban on meat products given that EU law only permits such a move in the case of a risk to public health. He added:
The spokesman said "the primary responsibility is with the retailers and suppliers" in the horsemeat contamination scandal, plus a "responsibility on those purchasing to check with their retailers and suppliers about the steps they have been taking to ensure the correct labelling".
David Cameron's official spokesman has said the horsemeat contamination scandal is "an issue of significant public concern".
He confirmed Environment Secretary Owen Paterson and Health Secretary Jeremy Hunt met with Mr Cameron at Downing Street this morning to discuss the problem.
"The Prime Minister will want to keep very much up to speed with what is going on," he said, adding that Mr Cameron had full confidence in Mr Paterson's response.
"Yes, the Prime Minister's view is that the Secretary of State is doing the right thing," he said.
British butchers have said they are enjoying an upturn in trade "by as much as 20 and 30%" as consumers steer clear of imported and processed products amid the horsemeat scandal.
"There has definitely been a spike in sales for the High Street butcher in recent weeks," said Brindon Addy, chairman of the Q Guild, which represents 130 butchers across England, Scotland and Wales.
He put the boom in home-grown meat sales down to a "trust issue," with confidence in cheaper meats of now-dubious content from Ireland and the continent plummeting.
"Some people are wising up," Mr Addy added. "If they buy a sausage worth tuppence, they've got to wonder what is really going into it. Horsemeat would probably be one of the better things to find in it."
Environment Secretary Owen Paterson has said the Government is powerless to impose a ban on meat imports unless beef contaminated with horse meat is found to be a health risk.
The government dismissed calls for a ban on importing meat from the European Union as the horsemeat scandal spread across the continent.
He added that farmers need better policies that help them invest, to support the produce of British meat, so that we know where the food we eat is coming from.
Latest ITV News reports
A leading food scientist says the rule change that sparked the horsemeat beef scandal affected lamb products too, and they should be tested.
Retailers and the Food Standards Agency held an emergency meeting today to decide how to proceed with the horsemeat scandal.