ROXBURY TOWNSHIP, N.J. — People detained during an immigration raid in nearby Dover on Sept. 4 say federal agents took them to a warehouse on Route 46 in Roxbury, a site that a court order bars the government from converting into a detention center while environmental assessments are pending. Their accounts, along with video and witness descriptions of vehicles arriving at the warehouse, have intensified calls for state and federal oversight. New Jersey’s attorney general has said the office is looking into reports of possible detention activity at the site and elsewhere. A man deported to Honduras told investigators he was arrested on his way to work, driven to the Roxbury property and held in the parking lot with nine other men for several hours before being transferred to a detention facility. He said he signed deportation papers while frightened and later regretted doing so. A Dover woman who followed a vehicle carrying detainees said it turned onto the road leading to the warehouse at about 8:25 a.m. She described two SUVs circling and filming her as she waited nearby. Another Dover resident said her 59-year-old father called her that morning, disoriented and handcuffed, and told her he was in a jail-like place. She has not spoken to him since. Dover Councilmember Sandra Wittner said relatives and friends of several men arrested that day told her the men had been inside the warehouse. She urged members of Congress to conduct an oversight visit and called on state officials to investigate and seek access to the property. The warehouse is among 11 properties the Department of Homeland Security bought in early 2026 as part of a roughly $1 billion plan to expand immigration detention. Lawsuits and community opposition stalled plans at several locations. In New Jersey, a court order bars conversion of the Roxbury site into a detention facility pending environmental review. The order permits certain upkeep but does not explicitly address every possible use of the property, according to Andrew Mergen, a Harvard professor and former Justice Department environmental lawyer. He said the dispute underscores how a restriction on constructing a detention center may not prevent the government from using the property in connection with detention. DHS did not directly answer questions about whether it held people at the Roxbury location. In a general statement, the department said it maintains strict standards in immigration detention and that people in custody may choose deportation. The broader warehouse initiative drew lawsuits from state attorneys general over environmental concerns, including potential impacts on local water resources. Some facilities are being sold, but the federal government has retained the Roxbury property and a small number of others. The reports from Dover emerged during a sharp rise in immigration arrests nationally. Community members say uncertainty about where people are being taken has compounded fear among immigrant families and neighbors.