Iranian Supreme Leader Ali Khamenei lashed out at Israel on Twitter Wednesday, calling the Jewish state a “fake nation” and the “most wicked terrorists.”

“#Israel was initially established thru oppression, massacre & lie; an invader aided by UK expelled #Palestinians out of their homes. #NakbaDay,” he wrote on the eve of Nakba Day, the date on which Palestinians and their supporters mark the creation of Israel as a national tragedy.

“During the over half a century since the existence of #fake Israeli state, suppression, lies & deception have been central to Israel’s survival,” read another tweet.

Khamenei tweeted out a rapid-fire series of messages shortly after 9 p.m. Israel time, or an hour before Nakba Day began in Iran on May 15.

“Which terrorists?!” he continued, referencing a statement by US President Barack Obama saying Washington cooperates with Israel to prevent terrorism. “The Palestinian who’s been driven out of his homeland?! No! The most wicked #terrorists of the world is fake Israeli govt.”

Nakba Day often sees violent protests in Israel and on its borders.

Three years ago, Israel witnessed an unprecedented number of disturbances across the country and on its borders with Syria and Lebanon. Some 15 people were killed in clashes when protesters, mainly from Palestinian refugee camps in those countries, organized mass marches and tried to storm the borders.

In the Israeli-annexed Golan Heights village of Majdal Shams, several dozen Syrian protesters managed to reach the village before they were turned back by security forces. One Syrian man even made it all the way to Jaffa before turning himself over to police.

In Tel Aviv that same year, one man was killed and over a dozen injured when an Arab driver from the village of Kfar Kassem went on a rampage of about two kilometers, ramming his truck into vehicles in his path, in what police called a terror attack. The man was tried, convicted, and sent to life imprisonment.