Israeli security officials on Thursday said an Israeli citizen has been indicted for involvement in an Iranian assassination plot against top Israeli leaders, including Prime Minister Benjamin Netanyahu. A statement from the Shin Bet internal security agency said that the citizen was recruited by Iranian intelligence to “carry out terrorist activities” on Israeli soil and “promote assassination attacks” on Netanyahu, Defense Minister Yoav Gallant and the head of the Shin Bet, Ronen Bar.

It was unclear how far the alleged plot had advanced.

The statement did not say whether the Israeli had obtained a weapon or developed a concrete plan.

The statement said the Israeli had traveled to Iran twice — once in August following the assassination of top Hamas leader Ismail Haniyeh in an explosion in Iran’s capital that was widely blamed on Israel. Israel has not said whether it was involved.

The Shin Bet said the assassination plot was an attempt by Iran to follow through on its pledge to avenge his death.

The statement said the Israeli was paid 5,000 Euros (USD 5,575.60) but had demanded a million dollars before doing anything. The Iranians refused the demand but said they would be in touch, according to the Shin Bet. Earlier this week, the Shin Bet said an explosion in a Tel Aviv park last September was linked to an attempt by Hezbollah to assassinate Moshe Yaalon, a former military chief of staff and defense minister.

The Lebanese militant group is closely allied with Iran.

On Tuesday, the police said they had found and dismantled a similar explosive device fitted with a camera and a mechanism that would allow it to be activated by Hezbollah.

It was unclear whether the indicted Israeli was linked to either of the alleged bomb plots.