The United States has captured a suspect accused of masterminding the deadly 2012 attack on the U.S. diplomatic compound in Benghazi, Libya, that killed four Americans, including Ambassador Christopher Stevens. Ahmed Abu Khattala was nabbed in Libya over the weekend in a raid coordinated by the FBI and the U.S. military. President Obama hailed Khattala’s capture.

President Obama: “It’s important for us to send a message to the world that when Americans are attacked, no matter how long it takes, we will find those responsible, and we will bring them to justice. And that’s a message I said the day after it happened, and regardless of how long it takes, we will find you.”

Khattala is the first Benghazi suspect to be detained in U.S. custody. The Obama administration says he will be tried in federal court and imprisoned in the United States, not at Guantánamo Bay. The Washington Post learned of Khattala’s capture on Monday but delayed publication at the government’s request.