AUSITN, Texas (AP) -

Austin police say they've broken what they suspect was one of the biggest human smuggling operations the city had seen in recent years, holding as many as 28 adults against their will in a trailer.

Assistant Police Chief Troy Gay said a tip led officers to the trailer Tuesday afternoon in a mobile home park in southeast Austin. A police tactical squad arrived and found 28 adults - some with hands tied, some with injuries.

Gay said it wasn't immediately clear which of the 28 were captives and which were captors. All were being questioned by police. However, Officer Veneza Bremmer said 26 left the trailer voluntarily while two refused to emerge until tear gas was used to rout them. They were taken to an Austin hospital for treatment.