Britain's House of Commons on Tuesday withdrew four beef products from its canteen menus as tests were carried out for traces of horsemeat, a spokesman said.
The move to test the "meat derivative" items was taken as a "precaution" as the horsemeat scandal directly affected lawmakers for the first time.
"A supplier (Brakes) to the House of Commons Catering Service is currently carrying out tests on its products containing beef," the spokesman confirmed.
"As a precautionary measure, the House of Commons Catering Service has removed from its shelves four beef items supplied by Brakes.
"This relates to meat derivative products rather than to fresh meat provided at the House of Commons," he added.
Brakes revealed that tests on two of the four items had produced negative results.
The tests were due to be completed by Friday, it added.
Twenty-nine beef products out of 2,501 tested in Britain have been found to contain more than one percent horsemeat, the Food Standards Agency said Friday.
Since the problem was first discovered in Ireland in January, governments have scrambled to figure out how and where the mislabelling of the meat happened in the sprawling chain of production spanning slaughterhouses and meat suppliers across Europe.