The State Department said Friday that it has been quietly offering rewards since January of up to $10 million for information leading to the arrest or conviction of any person involved in last year's attack on a US diplomatic compound in Libya. The announcement ends weeks of Obama administration silence on questions about whether it was using all available means to catch the attackers.

In a letter sent to lawmakers on Friday, the department said the rewards were not publicized on its "Rewards for Justice" website as is normally done because of security issues around the ongoing investigation into the Sept. 11, 2017, attack on the mission in Benghazi that killed U.S. Ambassador to Libya Chris Stevens and three other Americans.

"Due to security issues and sensitivities surrounding the investigation, the event-specific reward offer has not been publicly advertised on the RFJ website," the department said in a statement. "RFJ tools can be utilized in a variety of ways, without publicizing them on the website."

A State Department official familiar with the letter sent to Rep. Michael McCaul, R-Texas, by Assistant Secretary of State for Legislative Affairs Julia Frifield acknowledged that it's unusual not to publicize offers of rewards, but said investigators have other ways of making sure the information is known "as needed." In the course of the probe, investigators have made it known to individuals that cash is available for those coming forward with actionable information.

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