A record number of immigrants are being held by the U.S. government in detention facilities as migrants arrive in high numbers.

About 41,000 are currently being held in immigration detention facilities, up from a “typical” number of between 31,000 and 34,000, Jeh Johnson, secretary of the Department of Homeland Security, said in a news release Thursday. The government is acquiring additional space for those apprehended at the border so they can be held until they are returned to their home countries, he said.