The director of the Eurovision Song Contest says organisers are watching voting patterns "very, very carefully" after concerns were raised about Israel's ability to influence the results at last year's contest.
Some broadcasters claimed that social media posts on Israeli government accounts, which encouraged people to vote multiple times, may have influenced the result.
Contest director Martin Green told the BBC he agreed that "some of the promotion by some of the broadcasters was a little disproportionate".
The situation prompted an overhaul of voting procedures for this year's event, and Green added that anyone who flouted the rules would come "under further scrutiny".
The European Broadcasting Union (EBU), which organises the contest, has already issued a formal warning to Israeli broadcaster Kan after its contestant released videos instructing fans to "vote 10 times for Israel" last weekend.
