Iran was behind Sunday’s deadly cross-border incident in the south, Israel’s ambassador to the United States, Michael Oren, said late Sunday night.

Using social networking platform Twitter, Oren called the perpetrators of the attack, which left 16 Egyptian soldiers dead, “Iranian backed terrorists” who also wished to “massacre Israeli civilians.”

After shooting the Egyptian soldiers and commandeering two Egyptian military vehicles, the gunmen attempted to cross the border into Israel, but were stopped by the army and air force. The vehicles were destroyed and all the terrorists are believed to have been killed.

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In a later tweet, Oren praised the IDF for its swift response to the incident and wrote that “the thwarted attack underscores the length to which the extremist regime in Iran will attempt to kill innocent Israelis.”

Israel has blamed Iran for being behind the Burgas bombing in Bulgaria last month, which claimed the lives of five Israelis and their Bulgarian bus driver. Intelligence officials also blame Iran for planning a series of terrorist attacks against Israelis over the last two years, many times using proxies, such as Hezbollah.

Last week, Indian police concluded that Iran was behind the February bomb attack in New Delhi against Israeli Embassy workers, which seriously injured Tal Yehoshua Koren, wife of the Israeli military attaché in India.