WARSAW, May 14 (Reuters) - Poland said on Wednesday it

had uncovered what could be an attempt to interfere in its

presidential election campaign using advertisements on Facebook

that may have been financed from abroad.

The first round of the election takes place on Sunday,

pitting liberal Warsaw Mayor Rafal Trzaskowski, a senior member

of the ruling Civic Platform party, against historian Karol

Nawrocki, who runs Poland's Institute of National Remembrance,

and far-right Slawomir Mentzen.

"The NASK Disinformation Analysis Center has identified

political ads on the Facebook platform that may be financed from

abroad. The materials were displayed in Poland," NASK, the

national research institute dealing with cybersecurity, said in

a statement.

"The advertising accounts involved in the campaign spent

more on political materials in the last 7 days than any election

committee."

NASK did not say which country the financing might have come

from.

Poland has previously said that its role as a hub for aid to

Ukraine makes it a prime target for Russian espionage, sabotage

and cyberattacks.

Russia, which began its full-scale invasion of Ukraine in

February 2022, has denied previous allegations of meddling in

foreign elections.