A Hungarian official has suggested the country's first cases of foot-and-mouth disease in more than 50 years could have come from a "biological attack".

Axar.az reports, citing Sky news, the World Organisation for Animal Health, citing Hungarian authorities, said the country reported an outbreak of the disease on a cattle farm in the northwest last month.

Thousands of cattle have been slaughtered to stop the spread of foot-and-mouth, while neighbouring Austria and Slovakia have closed multiple border crossings.

Gergely Gulyas, Hungarian Prime Minister Viktor Orban's chief of staff, told reporters on Thursday that officials have not ruled out what caused the outbreak - including an attack.

"At this stage, we can say that it cannot be ruled out that the virus was not of natural origin, we may be dealing with an artificially engineered virus," he added.

The official then said suspicion of a biological attack was based on verbal information received from a foreign laboratory -- which has not yet been fully proven - and that no further outbreak has been detected.

Foot-and-mouth disease poses no danger to humans but causes fever and mouth blisters in cloven-hoofed ruminants such as cattle, swine, sheep and goats, and outbreaks often lead to trade restrictions.

Reports of foot-and-mouth first emerged in mid-March, with more than 3,500 cattle slaughtered in Hungary's northern county of Gyor-Moson-Sopron.