Iraqi intelligence officials offered today The Associated Press the letters, as well as the first known photograph of the Nusra Front leader, Abu Mohammed al-Golani, the head of one of the most powerful and feared bands of radicals fighting the Syrian government in the country's civil war.
The photograph showed a man with light olive skin and large brown eyes who had a scruffy, unshaven face.
"I was told by a soldier that he observed some of the workers of the UN and he will kidnap them. I ask God for his success," read an excerpt of a letter given by officials from Iraq's Falcon Intelligence Cell, an anti-terrorism unit that works under Prime Minister Nouri al-Maliki.
It was not immediately clear when the letters were written, or what else they may have contained. The intelligence officials did not provide more excerpts.
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One UN worker was kidnapped for eight months in Syria and was released in October. Another two dozen UN peacekeepers were briefly held this year. It's not clear if those abductions had any relation to al-Golani's letters.
They said the letters particularly focused on Shiite Muslims. Hard-line Sunni Muslim extremists particularly loath Shiites, seeing them as heretics for practicing a different style of Islam.
Another letter excerpt scrawled out rough plans for succession should al-Golani be killed.
The Nusra Front is mostly composed of Syrian fighters, but has some foreign fighters.