CAIRO (AP) — Libyan security forces on Friday detained at least 500 African migrants, including women and children, two officials and a refugee group said. Gargaresh, a known hub for migrants and refugees, is about 12 kilometers (7.5 miles) west of Tripoli, the Libyan capital. The chief prosecutor office said hundreds of arrested migrants were taken to detention centers. “Torture, sexual violence, and extortion is rampant in Libyan detention centers,” he said. Those returned to shore have been taken to government-run detention centers, where they are often abused and extorted for ransom under the very nose of U.N. officials.