A former Syrian military official who oversaw a prison where human rights officials say torture and abuse routinely took place has been arrested in Los Angeles, court documents show. Samir Ousman al-Sheikh, 72, was taken into custody last week at Los Angeles international airport on immigration fraud charges, specifically that he denied on his US visa and citizenship applications that he had ever persecuted anyone in Syria, according to a criminal complaint filed on 9 July. Investigators are considering additional charges, the complaint shows. Al-Sheikh was in charge of Syria’s infamous Adra prison from 2005 to 2008 under President Bashar al-Assad. Human rights groups and UN officials have accused the Syrian government of widespread abuses in its detention facilities, including torture and arbitrary detention of thousands of people, in many cases without informing their families about their fate. Many remain missing and are presumed to have died or been executed. “This is the highest-level Assad regime official arrested anywhere in the world … This is a really big deal,” Mouaz Moustafa, executive director of the Syrian Emergency Task Force, said Wednesday. Moustafa said one of his staff members, a former Syrian detainee, was first tipped off in 2022 by a refugee that there was “potentially a war criminal” in the US. His organization alerted several federal agencies and began working with them to build a case against Al-Sheikh. Investigators interviewed five former prisoners at the Syrian facility, who described being hanged by their arms from the ceiling, severely beaten by electrical cables, and witnessing other prisoners being branded by hot rods, according to court documents. One inmate described how he had his back broken by guards. According to the complaint, al-Sheikh, a resident of Los Angeles since 2020, stated in his citizenship application that he had “never persecuted (either directly or indirectly) any person because of race, religion, national origin, membership in a particular social group, or political opinion” and “never been involved in killing or trying to kill someone”. This was false, as al-Sheikh persecuted political dissidents and ordered the execution of prisoners while he was head of Adra from 2005-08, the complaint states. Al-Sheikh began his career working police command posts before transferring to Syria’s domestic intelligence agency, which focused on countering political dissent, the complaint says. He became head of Adra Prison and brigadier general in 2005. He also served for one year as the governor of Deir Ez-Zour, a region north-east of the Syrian capital of Damascus, where there were violent crackdowns against protesters. He had purchased a one-way plane ticket to depart LAX on 10 July, en route to Beirut, according to the complaint. Lebanon shares a border with Syria. Syria’s civil war, which has left nearly half a million people dead and displaced half the country’s prewar population of 23 million, began as peaceful protests against Assad’s government in March 2011. Other players in the war, now in its 14th year, have also been accused of abuse of detainees, including insurgent groups and the US-backed, Kurdish-led Syrian Democratic Forces, which guard suspected and convicted Islamic State members imprisoned in north-eastern Syria. In May, a French court sentenced three high-ranking Syrian officials in absentia to life in prison for complicity in war crimes in a landmark case against Assad’s regime and the first such case in Europe. The court proceedings came as Assad had begun to shed his longtime status as a pariah because of the violence unleashed on his opponents. Human rights groups involved in the case hoped it would refocus attention on alleged atrocities.