Tunisia says it has a 28-year-old Tunisian national in custody who is linked to the attack on the US consulate in Libya that killed Ambassador Chris Stevens, reports the AP. Details are sketchy, but the suspect has been identified as Ali Harzi. It's unclear exactly what role he played, but Eli Lake of the Daily Beast says Harzi posted about the attack on social media shortly after it began, drawing the attention of investigators. He reportedly fled to Turkey afterward, where he got picked up and handed over to Tunisia. One source tells Lake that Harzi belongs to "violent extremist networks."